|
My dads 455 pontiac spun a rod bearing again, this block, formerly a 428 engine has done this twice before! It has aftermarket rods, pistons, and a medium sized hydraulic cam.
The 455 made approx ten 1/4 mile runs and blew up again. Max RPMs at finish was between 5700-6000. Is there some inherent oiling issues with this engine? This engine has had three different people rebuild it, machined, everything ground up, with same end results. It was aligned bored. What is going on here??? And if its simply the rpms, what does everyone else do different that runs 12's, 11's, 10's and doesnt blow up? Thanks! |
My dads 455 pontiac spun a rod bearing again, this block, formerly a 428 engine has done this twice before! It has aftermarket rods, pistons, and a medium sized hydraulic cam.
The 455 made approx ten 1/4 mile runs and blew up again. Max RPMs at finish was between 5700-6000. Is there some inherent oiling issues with this engine? This engine has had three different people rebuild it, machined, everything ground up, with same end results. It was aligned bored. What is going on here??? And if its simply the rpms, what does everyone else do different that runs 12's, 11's, 10's and doesnt blow up? Thanks! |
That rpm seems high going thru the traps. What rear gears are you using? My 67 goes thru the traps at 5500rpm, turns 12.6, that's with a 3.73 rear. My engine is a 455+.030 over with trw pistons, and SD rods, 4 bolt mains with studs. Same engine since 1991 and before I bought it, it was a drag only car with the same shortblock.
What are your clearences on the bearings? Are you using studs for the mains? What is your oil pressure at idle?, at speed? Mine at idle is 25lbs, cruising 60lbs, and when drag racing 80lbs. I'm no expert, but it seems to me that your bearing clearances may be to loose, or your just spinning it to high. 455's don't need much rpm to get them moving down the track. |
We remember it being about 20lbs a idle, in gear, when warmed up. I guess my dad didn't run it enough times to think about checking it "down track". LOL It also has 3.73 gears, and was using 28x9 m/t slicks; sounds like the converter is slipping WAY too much, huh? Do you think 5800-6000 alone is what got it, or some other issues here?
|
When I lost my motor in August, we discovered that one of the mains was egg shaped, due to a poor line bore job. When assembled, everything was within tolerances, as the bearing was still round. Under running pressure, the bearing moved out, blocking the oil supply off. I would check that.
I don't that your RPM is excessive for the parts you have in the short block. "Do you love me? Do you hate me? Ready or not....Here....I......come....." Ja Rule |
I don’t think your RPMs are out of line at all. Too many of us are seeing 6000-6500+ with out incident.
with out questions there can be no answers 1969 Grand Prix [email protected](1.358) [email protected](1.342) WARPed Tepee Forums [email protected] |
If you don't already have one get a RPM limiter.
You'd be surprised at what rpm's you turn doing a burnout. Also at the end of a pass make sure you don't slam the brakes too hard forcing the oil away from the pickup. Make sure the oil galleys are clean.A lot of shops around here don't bother cleaning them out. They figure hot tanking them will work. johnta1 Pontiac Power RULES !!! www.wallaceracing.com http://wallaceracing.com/johnta1plate.jpg |
Hmmm, some fundametals Best PRactices followed by me:
I re-affirm hand-picking the 428/455 block to be free from need for line-bore. I re-affirm keeping stock hard-parts in-place until there is strong concern for failure in the application. I re-affirm that I will run low 11's or high 10s (10.5sec) while keeping the Revs under 5200RPM. yea, It's just metal...with a pedigree. H.I. Stud "11.00/123MPH/1.50 60foot/29.5"/4.10:1/10"/472 #48/Flat HYD/DualQuad/Wenzler/3250Lbs 12.00/112MPH/1.61 60foot/26"/3.31:1/10"/472 #48/FlatHYD/Q-Jet/Torker/3650Lbs" |
was it the same bearing?? maybe #7 or #8.
Seen a problem once where a guy would consistently wipe out the rear main, #7 or #8. He had a high RPM stall converter. When driving on the street the conveter would heat-up transfering the heat to the rear main, wiping out the rear main, #7 or #8. That was our theory anyway! After changing the converter, never had a problem. PHS Documented "REAL JUDGE" 12.53 @ 110.68 on street tires, through the mufflers and a 4 speed!! |
So much on the theory of the defective OEM Pontiac timing chain covers causing the engine failures. [img]/infopop/emoticons/icon_wink.gif[/img]
http://kurtspontiac.homestead.com/files/77canam.jpg |
Still haven't found that piece of aluminum............
"Do you love me? Do you hate me? Ready or not....Here....I......come....." Ja Rule |
[QUOTE]Originally posted by Goatman:
Still haven't found that piece of aluminum............ Is this true or false? Or Multiple choice. [img]/infopop/emoticons/icon_biggrin.gif[/img] How about...........Cause it wasn't in there to begin with? [img]/infopop/emoticons/icon_rolleyes.gif[/img] [img]/infopop/emoticons/icon_biggrin.gif[/img] [img]/infopop/emoticons/icon_biggrin.gif[/img] Q-16 Norwalk Qualifying [email protected] 2nd Round, [email protected] ...Radials... hard on the brakes, Ray. LOL. http://PontiacDude.cc |
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by Rick Lightfoot:
So much on the theory of the defective OEM Pontiac timing chain covers causing the engine failures. [img]/infopop/emoticons/icon_wink.gif[/img]<HR></BLOCKQUOTE> Oh yea', here we go! Let's get it spun up good! [img]/infopop/emoticons/icon_razz.gif[/img] http://kurtsplates.homestead.com/files/badta.jpg SECOND AMENDMENT: AMERICA'S ORIGINAL HOMELAND SECURITY. I Misus Rash'! |
Ken, the cover was intact when installed......
"Do you love me? Do you hate me? Ready or not....Here....I......come....." Ja Rule |
Paul Spotts sells several versions of aftermarket timing covers.
Starting with original Moon stuff for $150 and all the way up to pretty but unnecessary billet covers. Paul's prices on billet covers are the best deal around. www.spottsperformance.com [img]/infopop/emoticons/icon_wink.gif[/img] |
Not really, but they are nice and they are a damn site better than the factory ones, for several reasons. Have one on my engine already. If anyone wants to see a pic of a really nice, quality billet timing cover, drop me a line. Already have it installed on a mock up motor.
"Do you love me? Do you hate me? Ready or not....Here....I......come....." Ja Rule [This message was edited by Goatman on October 19, 2002 at 07:17 PM.] |
We heard that High PRESSURE oil pump would help the 455's "high bearing speed" and oil that area better under higher RPM's, what do you guys think of this?
|
Bandaid on a shot gun wound...........
"Do you love me? Do you hate me? Ready or not....Here....I......come....." Ja Rule |
Rip it back out and find out whats wrong. If you can't, take it somewhere that can. Too many failures to keep screwing with it.
http://kurtsplates.homestead.com/files/budgto.jpg My Rig's a little old, but that don't mean she's slow. [This message was edited by Bud Lyons on October 26, 2002 at 12:22 AM.] |
was it a main bearing or a rod. clearance must be checked as crank or rods are bolted together , as well as with bearings only installed .,6000 rpm is not to much . some one is missing something during assy.
|
Check your oil pump passage to block passage. I had a misalinment problem on a block years ago, and after polishing the passages in the block, discovered the problem. I had an SD455 pump and couldn't get more than 20lbs at a 1000 rpm idle. Double check the oil feed holes to bearing holes too. And don't forget to clean the crankshaft's oil passages and alinmentto the bearings. Also,what direction was your crankshaft turned and polished? I 've seen shops turn crankshafts the opposite way from the way it turns in the engine. If the crank is turnned or polished that way, it will eat bearings. What happens is there is material that is left sticking up like ,say teeth, that srubs the bearing. If you could see it under a microscrope, it would amaze you. To check your pump to block passage, get two studs to put in the block, then use machinist dye on the pump face, and slip it on while the dye is still wet. Push just enough to leave a tracible ink stain on the block. The opening in the block and pump can then be "ported" to match. Hope this helps.
|
Ok I need to stir somthing up..... whats this story about timing chain covers Im missing somthing?????? [img]/infopop/emoticons/icon_confused.gif[/img]
8.90 @157 mph 3424 LBS. 77 Trans Am All Steel, on 10" tires http://home1.gte.net/res1e7lq/Images/plate.jpg http://home1.gte.net/res1e7lq/Images/fogged.jpg |
[img]/infopop/emoticons/icon_biggrin.gif[/img]
http://forums.performanceyears.com/g...5526035811&p=1 [img]/infopop/emoticons/icon_biggrin.gif[/img] http://forums.performanceyears.com/g...1&m=1056084611 [img]/infopop/emoticons/icon_biggrin.gif[/img] [img]/infopop/emoticons/icon_biggrin.gif[/img] |
HAHAHAHAHAHAHAHA!!!!!!!!!!!!!!!!!! [img]/infopop/emoticons/icon_wink.gif[/img] [img]/infopop/emoticons/icon_razz.gif[/img]
http://kurtspontiac.homestead.com/files/77canam.jpg |
Hoo boy! Here we go! [img]/infopop/emoticons/icon_razz.gif[/img]
http://kurtspontiac.homestead.com/files/CALIPLATE4.jpg |
The real challenge is to sit back and do nothing. Just like the kings..........
They'll talk all day, but when it comes to time show something, they all dissapear! LMAO "Do you love me? Do you hate me? Ready or not....Here....I......come....." Ja Rule [This message was edited by Goatman on October 27, 2002 at 10:00 PM.] |
Hey, Bruce! You coming down to splATCO? I finally got the Discomobile running again. Would be nice to share a brew with you after I lose out in the 1st round (LOL).
http://kurtspontiac.homestead.com/files/bbaker.jpg |
Brian, I may be there. I was at NED tonight for the last day ceremonies (where everyone tries to beak their sh*t!) and it was cold and started raining at the end of the night. I think I may be sick now! LOL Been a very long week.
I may show up just to see Misus'headers though. Who really knows. LOL "Do you love me? Do you hate me? Ready or not....Here....I......come....." Ja Rule |
| All times are GMT -4. The time now is 04:58 AM. |