Sign up for a new account in our community. 2 cylinder does not fire. If anything you could say the 670 is a little big, at least on paper. i drained the oil & no antifreeze in the oil. After 5 years I finally have an engine and transmission in my car, but it's overheating! Please don't worry about bandwidth issues guys, I find this fascinating and I suspect others will as well. i agree 100%. The Fora platform includes forum software by XenForo. A: We don't think you need a new distributor. I might be full of shit, but maybe someone else can corroborate my story. Originally posted by Chubby_Deuce That would be what I would do. He found some of the rocker assemblies had rocker balls that didn't fit the rockers very well-the balls were only making contact on the outer edge of the radius. Make sure it isn't engaged. Really solid engines with no real problems that I know of. Nov 19, 2006. I also installed a new Performer intake as well, new Comp Cam (268H) with lifters, new water pump, & Comp Cam roller tip rockers. that may be so, but if its getting hot over 30mph. will only affect the first few instants or so of throttle opening. A: We dont think you need a new distributor. by pdq67 Fri Apr 22, 2011 1:15 pm, Post Your thoughts? That would be what I would do. Sounds more like they're stuck. That's bad enough, but if it is a small base-circle cam, the lifter can actually tip slightly the bore. Try bypassing it? I only pulled the passenger side one off. modelacitizen, Jan 1, 2009 SHARE POST #1 It's OK to giggle and snicker. That said, the aftermarket provides stroker kits that bolt into a 400 to make it a 455.
Bad hesitation | Pontiac GTO Forum The rear main seal leaked badly too. What kind of fans, what size radiators, high flow pumps etc . Racers rework the heads to block off the passsages to the intake and force the exhaust out on the correct side of the engine. In addition, the crank journals are different sizes. 1970 Pontiac 400 Engine Edelbrock Performer RPM round port cylinder heads. plus agree with that the fan blades edges are too far from the shroud. IMO 1miunte40seconds is too long and he should be seeing oil reach the rockers within a few seconds after startup. Anyway, thanks for all the advice/help everyone. Pontiac Firebird General Technical Discussions, Fourth Generation Pontiac Firebird (1993 - 2002), Second Generation Pontiac Firebird (1970 - 1981). A forum community dedicated to hot rod owners and enthusiasts. Enjoy banner ad-free browsing with Firebird Nation Plus.
Is a 1975 Pontiac 400 Weak? | Firebird Nation OKi'm officially stumped. Great guy. Originally posted by Chickenman Actually a 670 Avenger is a bit small for a 400 CI motor, particularily on a Dual Plane manifold such as the Performer. any ideas? Engine is the original 400 that has recently been professionally rebuilt. Originally posted by Big Block 8 Nice set of wheels you have there Menace!My 2 cents in addition to McGuire's input. This engine has about 1,000 miles since the second rebuild. No need to spin them so much, they are like the Ford FE engines grunt grunt and more grunt on top of grunt. The pump is tough to install because it mounts to the block and intake all in one motion so it's hard to prevent leaks. Sounds like it's just loading up the cylinders when you leave the line. Keep in mind this was all stuff that was fed to a dumb kid with his first car and I haven't had that beast for years. Vintage/Classic/Historical Engine Tech, 3V Performance Engine & Valve train Development, Race Cars & Parts - For Sale or Wanted. Do I need to get a new distributor and damper? I then intalled a new original 4 core big block radiator, a milodon 180 high flow thermostat, & a 16" electric fan to the front that pushes about 2100 cfm. ", Copyright 1996-2023 First Generation Firebird, http://www.wallaceracing.com/water-pump-mods.php, http://s1122.photobucket.com/albums/l531/dolterdb/, https://www.facebook.com/photo.php?fbid=1872&type=3, https://sphotos.xx.fbcdn.net/hphotos-ash3/531235_10151094008326873_1943930314_n.jpg, http://www.highperformancepontiac.com/tede/viewall.html, Powered by UBB.threads PHP Forum Software 7.7.3. May 1, 2013.
pontiac 400 oiling question | Chevy Nova Forum Enjoy banner ad-free browsing with Pontiac GTO Forum Plus. I noticed you have said "plates" a couple of times in this post. Nice set of wheels you have there Menace! I made an incorrect assumption. Pontiac Engines - The low down. Off topic, but maybe will still fit in here?? I know there are a few Pontiac faithful on here. there is some good info on clearancing the water pump in the jim hand book.
Pontiac 400 that is about to make me pull my hair out. CR worked out to 10.1:1 or something. Oil pressure seems fine but it takes 1minute and 40 seconds for oil to reach the rockers upon startup-this is with a high speed idle of 1400rpm. So your engine will run warmer but won't boil over. When the engine is hot you have pressure in the cooling system.
400 pontiac engine | The H.A.M.B. - The Jalopy Journal Has the car been parked for an extended period? Gets worse when motor warms up. If it idled longer, or drove for a short period, temps climbed over 220 & up & up. Over the course of the Pontiac 400's build cycle, Pontiac tweaked the engine and offered it in different configurations, differing primarily by carburetor type and intake system. Make sure you are using the #1 cylinder to time your 400. Overheating problem Firebird 400. Dad had a pontiac with a 421 . Weve got answers. Bob. You mentioned installing a cam, did the timing chain crank gear have the 3 keyway slots?
Lots of good information Chickenman. i did a quick search and see that there are 2 separate plates in the. When you pull the plug is there fuel on the electrode to potentially rule-out a valve issue? lol) I'm not building a race engine. Is this car a stick or an automatic? Does this distributor have mechanical advance, vacuum advance, both, or neither? I'm stumped. I do have a 5 blade flexalite fan connected to the water pump & with the OEM fan shroud on as well. I plan on doing a hydraulic roller setup on this one. I wrote those words, and after researching it seems I definitely mis-spoke when I chose the word "incompatible." If it is "completely incompatible with any other coolant/water" I would be concerned with an emergency maintenance issue. A forum community dedicated to Pontiac GTO owners and enthusiasts. Regarding motor mounts, lengths etc. Yes it would! 13
1966 GTO Pontiac 400 engine problems | Pontiac GTO Forum I will double check it when I get home today. Most of the part-throttle tuning is accomplished by changing the power valve in the primary metering block, and by altering the opening rate of the secondaries. Jan 21, 2020 A friend of mine has a 67 Firebird with a Ram air III 400 motor. I will probably also buy the Edelbrock Performer RPM heads for it. This page was generated at 01:27 AM. Pontiac 400 Engine Tech Q&A: Vintage Pontiac - Performance And Restoration See all 1 photos Related Video Click to Unmute Guy Radcliffe writer Apr 1, 2007 Building The W72 For Hot Street. #2 Greg Locock Member 6,221 posts Joined: March 03 Posted 04 November 2004 - 21:17 Well I'm glad you bought a billet distributor, I must admit that's the first thing I think of when working on an. It would certainly make me wonder why I didn't just buy another Edelbrock! The engine fires a bit then the starter . Originally posted by Menace Thanks Big Block 8, but I have a mechanical advance no vacuum line coming off the distributor.;). Remove the rotor too and see if the backfeed has burned thru to the shaft. Timing.. Just went thru this. I had no overheating issues last year at allthat's why I'm stumped. The main stud's in the 400" Pontiac stud kit should measure 4.750", all 10 pieces. This week,were troubleshooting timing issues on a 400 c.i.d. It's not hard at all if you do it all the timeor you can always go to the local library and photocopy the vacuum schematic from the service manual. My vote, snake oil. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. My 428 was block filled to the freeze plugs. by Shopboss Fri Apr 22, 2011 7:32 am, Post Discussion in 'The Hokey Ass Message Board' started by modelacitizen, Jan 1, 2009. I'd go for balancing, ARP bolts and good set of valve springs first. Tom. Copyright 2023 BangShift LLC | Hosted and maintained by. The Pontiac is a perfectly respectable engine if you respect its qualities, high rpm operation not being one of them. . Do you have a heater? Youve got questions. If the hose collapses when you rev the engine it only does so when the engine is cold. For a better experience, please enable JavaScript in your browser before proceeding. Chrysler built its last carbureted automobile sometime around 1988, and they had all retired! Check the manuals for correct details and make sure to plug the ports not needed. You could not make a quick repair along the way without some of that coolant. I'll make sure to use ARP bolts as well. On the lifters: if you compare a Pontiac lifter to a Chevy is there a visable height difference on the oil band and which is higher or lower? jay Member from Bayard N.M. USA A friend of mine has a 64 catalina 4 door that he says has a 400 pontiac in it..Are these good engines to play with?? Originally posted by Big Block 8 Otherwise I agree, but I hope anyone won't take that as a hint that 6000 rpm is healthy for a stock Pontiac V8.
Recipe for a 67' 400 hp build? | Pontiac GTO Forum What kind of fans, what size radiators, high flow pumps etc . Those filler panels may be of no value at all for this particular car. Pontiac and Firebird are Registered Trademarks with General Motors. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Pardon me while I rambleOne of my favorite street engines ever was a 455 I threw together out of junkyard parts years ago. Couldn't see turning it down being as it was a running engine. Only? If not, the cam is no longer synchronized with the crankshaft and a new timing chain and cam gear is needed. BTW Menace, where are you from? My last & only guess is that a water passage is plugged, possibly the head gasket or intake gasket? I had assumed that you were Finnish but I don't know of any with 71' Firebirds. 455 has 4.15 bore x 4.21 stroke with 3.25 mains. I put it in my big old two-tone '72 Grand Prix (very sharp, white interior!) They found that the engine provided massive amounts of low-end torque and rock steady high RPM power output. I'd only run a forged crank and 4-bolt caps if i was building an endurance/road race motor- otherwise it's overkill and a waste of money on a street motor. How does the engine run at full throttle and/or high rpm? Originally posted by McGuire Vacuum hose routing is "simply" a matter of understanding what all those devices are intended to do: idle or PT, cold engine or warm, etc. check the simple stuff. However the accelerator pump will only affect the first few instants or so of throttle opening, so it's probably not your problem. This design maximizes the amount of heat at the air/fuel mixture which is an obvious power loss.
i just looked at the undersid of the divider plate closest to the impeller, here the impeller was rubbing the plate pretty badly, around 50% of the circumference of the opening. Sounds like you have a thermostat, that is important as the coolant needs to stay in the radiator long enough to cool. thanks for all the help everyone, I had a similar problem it had air in the system and I switched to Holley carb because it was running to lean that solved my problem, 68 400 engine seriously overheatingout of ideas, Re: 68 400 engine seriously overheatingout of ideas, 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. Guru Posts: 8658 Joined: Sun Jan 21, 2007 6:16 pm Location: Victoria BC Canada Re: Oversized thrust bearing for 400 PONTIAC by ProPower engines Wed Feb 01, 2017 8:42 pm drifter wrote: Does anyone have a ACL5m2496-030 main bearing set ? Jan 15, 2019 (Edited) 400hp is no problem at all with a 9:1 CR stroker.
Pontiac 400 cooling issues | Hot Rod Forum If nobody has been moving the distributor around you should be able to turn the crank to TDC and see if the distributor rotor points to #1 (or exactly away from #1). Whoever you got it from was not the best at working on it. Upstate New York, watching my New Yorker Rust, (You must log in or sign up to reply here. There are some engine mount differences, but I am pretty sure all the blocks after 1964 will fit the 1st gen birds. You don't need to worry about the lower hose closing up, in my opinion. ). On the street out of a Pontiac engine, that is quite a bit. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! Can you give me the low down? Are you getting spark to the plug? Does the engine backfire? the water exiting the engine & going back into the radiator is 200 degrees. oh ok I say the 68 firebird needs a BBC. So I recently bought a 1977 Firebird Formula, with a 1974 pontiac 400 big block (got the year off the rear engine code). Lousy if you're lookin for performance. I've read so many things about water wetter and the like just being 'snake oil'. Install the red bushing on the stop pin and the two light silver springs on the advance weights according to the instructions and you should be very close, according to what I can see from the advance curves pictured on the site. If at speed, then it is likely a coolant flow or other problem. The distributor is from the Firebirds original 301 engine and the damper is from one of the 400s.
Pontiac 1969TA 400 oiling problems??? - Don Terrill's Speed-Talk Originally posted by McGuire With the #1 piston at TDC (first cyl on the RIGHT bank on a Pontiac). However the accelerator pump will only affect the first few instants or so of throttle opening, so it's probably not your problem. ?
68 400 engine seriously overheatingout of ideas - Firebird by machine shop tom Sat Apr 23, 2011 10:19 pm, Post The ones that were in the GTOs and such were a heavier duty motor with great performance options. When the powder blocks the voltage, it backfeeds into the button and can burn it off in the cap. Originally posted by McGuire I totally agree. It would certainly make me wonder why I didn't just buy another Edelbrock! The first and by far the worst is the car has started hesitating really bad when I step on the accelerator. Originally posted by Menace Greg,I have checked the timing with a timing light, and that is one of the reasons Im a little confused. Here I was merely illustrating the best-case airflow requirements. He had to swap out the lifters. Jun 18, 2010 (Edited) The 1.96" exhaust valves jumped out at me- the stock 1.77" valves are considered big enough for the 2.11" intakes for a NA engine in most every case I've seen. I know nothing about GM engines and before we take the pan off and and change the oil pump. I say this because he stated up front he has an electric fanwhich is likely meaning his fan is pressed up tight against the radiator and not set back at the engine like our stocker setups aremaybe meaning he doesn't need any of the fillers at all and they may serve no purpose. If something were to happen on the trail and you are forced to add water or anti-freeze, it will simply perform like conventional anti-freeze, no worse. by GOSFAST Thu Aug 14, 2014 10:05 pm. If, on the other hand, the rotor is pointing where it should, then proceed to a compression test. Using a 72cc chamber with a 4" 4.25" stroke crank puts the SCR at 11.25-11.9:1, too high for pump gas. pipes dont get hot. Tom Posted June 1, 2019 Don't worry about the oil pump. set wrong can really make it run hot! During acceleration tests, if you notice that the car first hesitates and then picks up, it's a sure bet that the pump nozzle size should be increased. It's easy! .
had this shit too right fucking now! Pontiacs tend to run hot, aluminum heads will cool the bitch rite down. It will surge a little then eventually start to slowly accelerate. The weird thing is that the timing Haas to be retarded 15 to 30 degrees for it to run (that's without the vacuum advance hooked up). 400 pontiac engine Discussion in ' The Hokey Ass Message Board ' started by jay, Sep 30, 2006 . The engine has HEI, a edlebrock performer pontiac Intake, and stock carb (for now). Could the gas have gotten stale ? I will play with the pump tomorrow if I have time hopefully it's something relatively simple like that! water is the best coolant.if anything welse works it sure cannot be much betterthink you`re just paying a high priceimo. Good luck. thanks medhat68, trying not to give up on it just the frusteration level is climbing. I can see 4-5 minutes to get oil to the rockers during prlubing a new motor that happens all the time. Very much appreciated. They also had a lighter duty 400 (Bonneville, executive, etc.) by machine shop tom Fri Apr 22, 2011 10:37 am, Post Originally posted by McGuire Carburetors, distributors, mechanical advance springs and weightsI'm sure Mr. Locock finds all this very quaint. by Shopboss Fri Apr 22, 2011 6:25 am, Post Time to do some research. And the flex fans often have mixed reviews and . Butler LS and Butler Pontiac are part of Butler Performance. Re: Pontiac 1969TA 400 oiling problems? 13CADDY's timing chain is a good guess. by machine shop tom Sat Apr 23, 2011 10:37 pm, Powered by phpBB Forum Software phpBB Limited, General engine tech -- Drag Racing to Circle Track. Jul 22, 2009 I have read a few other posts on this topic.saw some interesting things. Also, I'm recovering from a foot operationSo I'm stuck at home. So how do you guys running big inch engines cool them off. Not too hard to make 400hp with a high CR 400. My car was doing the same thing.I , like you checked everything. So I recently bought a 1977 Firebird Formula, with a 1974 pontiac 400 big block (got the year off the rear engine code).
Mailbag: Troubleshooting Timing Problems on a Pontiac 400 Engine Pontiac 301, are they really that bad? | The H.A.M.B. The Holley 4150 series is nearly infinitely adjustable anyway, so no worries. i first read that & immediately started to freak a bit but now i realize that those aren't on my year.
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