Turbo bottom End weak link
Originally Posted by barthelb
I think i have one of the longest boosted engines on a stock block. I currently have 62000 miles, my car was boosted at 28k. I've made 400whp or more the whole time.
My reason for why its lasted is one the tune, two my regular 2500-3k oil changes and monitoring oil level, consistent mix of about 4+ gal 100oct every fill-up, and my Z32 Oil cooler.
My reason for why its lasted is one the tune, two my regular 2500-3k oil changes and monitoring oil level, consistent mix of about 4+ gal 100oct every fill-up, and my Z32 Oil cooler.
M
MRC, weak rod bolts result in rod stretch....then you can guess what happens after that.
Like I said...only one reported instance that I can recall of a rev-up motor failing....and that probably had more to do with tuning, that with anything else.
Like I said...only one reported instance that I can recall of a rev-up motor failing....and that probably had more to do with tuning, that with anything else.
Originally Posted by Sharif@Forged
MRC, weak rod bolts result in rod stretch....then you can guess what happens after that.
Like I said...only one reported instance that I can recall of a rev-up motor failing....and that probably had more to do with tuning, that with anything else.
Like I said...only one reported instance that I can recall of a rev-up motor failing....and that probably had more to do with tuning, that with anything else.
You act as if you know everything sometimes...What Im saying is the rods I have seen fail, did not fail due to rod stretch, and the resulting contact of the piston VS valve..In this cast the valve would bend far before a rod would snap..The rods I have seen bent or snapped are as a result of structual fatigue or detonation..In some cases the rods even caused the crank to bend, I have seen this on Paranormal's motor twice...The bottom line Im trying to say is just because you say so does not make it 100% applicable all of the time..In my opinion the rev up rods are no stronger as a result of rod end bolts, the only thing this allows the rev up motor to do safely is rev to 7300 rpms N/A....This is not 100% proof that the rev up rods are that much stronger than non rev ups just cause Sharif says so..
Originally Posted by MRC Motorsports
I know this, I even stated it in my last post, your not telling me something I dont know for about 15 years already
You act as if you know everything sometimes...What Im saying is the rods I have seen fail, did not fail due to rod stretch, and the resulting contact of the piston VS valve..In this cast the valve would bend far before a rod would snap..The rods I have seen bent or snapped are as a result of structual fatigue or detonation..In some cases the rods even caused the crank to bend, I have seen this on Paranormal's motor twice...
The bottom line Im trying to say is just because you say so does not make it 100% applicable all of the time..In my opinion the rev up rods are no stronger as a result of rod end bolts, the only thing this allows the rev up motor to do safely is rev to 7300 rpms N/A....This is not 100% proof that the rev up rods are that much stronger than non rev ups just cause Sharif says so..
You act as if you know everything sometimes...What Im saying is the rods I have seen fail, did not fail due to rod stretch, and the resulting contact of the piston VS valve..In this cast the valve would bend far before a rod would snap..The rods I have seen bent or snapped are as a result of structual fatigue or detonation..In some cases the rods even caused the crank to bend, I have seen this on Paranormal's motor twice...The bottom line Im trying to say is just because you say so does not make it 100% applicable all of the time..In my opinion the rev up rods are no stronger as a result of rod end bolts, the only thing this allows the rev up motor to do safely is rev to 7300 rpms N/A....This is not 100% proof that the rev up rods are that much stronger than non rev ups just cause Sharif says so..

Originally Posted by 350zDCalb
Wow...a bit touchy today? Take a deep breath man, its gonna be alright.

MRC, you are being extremely over-sensative. When I made my original comments, I was clear to point out, that my statement was conjecture and speculation.
I had no intention of discrediting your knowledge. I actually agreed with what you are saying....not sure where that came from.
My point was simple (and it is admittedly still speculation), is that the improved rod bolts in the rev up engines, APPEAR to result in less bottom end engine failure. Whether the rod bolt, or the rod strength is the cause is immaterial to the discussion. I just havent seen many rev-up engine failures.
Can you, or anyone else, point is to another rev-up engine (besides paranormal's)that has failed in this manner?
I had no intention of discrediting your knowledge. I actually agreed with what you are saying....not sure where that came from.
My point was simple (and it is admittedly still speculation), is that the improved rod bolts in the rev up engines, APPEAR to result in less bottom end engine failure. Whether the rod bolt, or the rod strength is the cause is immaterial to the discussion. I just havent seen many rev-up engine failures.
Can you, or anyone else, point is to another rev-up engine (besides paranormal's)that has failed in this manner?
Last edited by Sharif@Forged; Oct 15, 2006 at 04:08 PM.
My friend has a revup '05 G35 out here in Cali and his engine snapped a rod and threw it through the block with his APS TT. Not sure if it had anything to do with the strength of the rod as it could have been an issue not caused by stress. Not enough engines to make an educated guess. My belief is gas and oil are probably the biggest contributors to engine failures besides having a good foundation which is the tune. Not having a good high octane gas for insurance and proper oil level and or frequent enough changes. Two cents worth.
back when I got my rev-up tuned by SP, it was holding 13psi peak boost. Had that for about 5000 miles with no problems...albeit it was on full 100 octane fuel. When my block was torn apart recently, the rods didn't show too much stress either.
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