Front main bearing weear and SC applications FYI
12-02-2004 | 04:23 PM
#46
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From: virginia
Originally Posted by Jim bailey - 928 International
Tom Falkenberg has been racing his 6 liter supercharged Yellow racer . It was originally constructed several years ago by Tilo ,sold to a another, then sold to Tom.
12-02-2004 | 05:37 PM
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Originally Posted by GoRideSno
Curtis,
Coged belt = very hard on bearings. Some SC mfgrs will not waranty after cog belt use.
Marc,
What type of SC was it?
What was the position of the belt on the crank pulley?
What is the diameter of the crank pulley?
How is the crank pulley shaped?
What was the tension reading on the belt?
What other accesories were run?
ALL of these must be known before any type of information on this can be called useful.
Andy K
Coged belt = very hard on bearings. Some SC mfgrs will not waranty after cog belt use.
Marc,
What type of SC was it?
What was the position of the belt on the crank pulley?
What is the diameter of the crank pulley?
How is the crank pulley shaped?
What was the tension reading on the belt?
What other accesories were run?
ALL of these must be known before any type of information on this can be called useful.
Andy K
12-02-2004 | 08:33 PM
#50
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From: Los Angeles, CA
Either FAST, or a Delta-P bracket...
But judging from Andy's comment from Corky Bell,
it sounds like no matter how bad the bracket design,
it shouldn't put too much excessive wear on the crank bearing...
But judging from Andy's comment from Corky Bell,
it sounds like no matter how bad the bracket design,
it shouldn't put too much excessive wear on the crank bearing...
12-02-2004 | 08:49 PM
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Originally Posted by heinrich
And Z adds, he has seen sample number THREE with no such wear.
Originally Posted by T_MaX
I hope that in the near future you Stroker and SC guys can find a way to work together as a team and come up with a SC’d Stroker prototype.
12-02-2004 | 08:53 PM
#52
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Perhaps if this thread were titled " Front main bearing wear, anyone observed it ? " It would have been interpreted as a quest for knowledge and information. The only fact was there appeared to be unusual wear on the bearing and it had a supercharger. The conclusion that it was the result of the supercharger is where the logic may break down. The experiences of Rob, Z and Corky Bell would seem to indicate that the original theory is in fact far more likely incorrect. Certainly it is something to keep in mind but requires that you completely tear down an engine to check. I wonder how tight the timing belt was since it also pulls "up" ? The expressed surprise that no one else has noticed this simply reinforces how completely committed to a potentially false theory one can become but also implies that it should be expected ! The positive result of this thread is there does NOT appear to be a problem. While I may have presented it rather poorly the point remains most engines now use a single serpentine belt turning th PS ,Alt ,A/C ,smog which loads the crank in only one direction.
12-03-2004 | 12:16 AM
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From: Anaheim California
Kevin that appears to be the case for the 1987 no cat Euro ROW cars. Also note the belt driven fan on 78-86 changed the direction of the pull on the crank pulley somewhat.
12-03-2004 | 01:04 AM
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From: Boulder Creek, CA
Originally Posted by Kevin Q
Is the air pump only on US spec cars? If so, then removing the belt surely can't effect the front bearing wear as you are merely returning the car to its original configuration.
12-03-2004 | 03:08 AM
#57
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From: No Turbo, No SC
"Perhaps if this thread were titled " Front main bearing wear, anyone observed it ? " It would have been interpreted as a quest for knowledge and information."
Bailey, how right you are! At times we can all be abit off with our chosen words
I forgot about the old Tilo car. That is a intercooled Vortech SC, yes?
How many differant SC kits are there now and from who?
Fast = Vortech
? = Delta-P
Andy K = Twin Screw
Anyone else?
Bailey, how right you are! At times we can all be abit off with our chosen words
I forgot about the old Tilo car. That is a intercooled Vortech SC, yes?
How many differant SC kits are there now and from who?
Fast = Vortech
? = Delta-P
Andy K = Twin Screw
Anyone else?
12-03-2004 | 06:19 AM
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Originally Posted by T_MaX
How many differant SC kits are there now and from who?
Fast = Vortech
? = Delta-P
Andy K = Twin Screw
Anyone else?
Fast = Vortech
? = Delta-P
Andy K = Twin Screw
Anyone else?
www.Murf928.com = Vortech
www.928motorsports.com = Powerdyne
www.albrex.com = Albrex
12-03-2004 | 12:09 PM
#60
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From: Redondo Beach, CA>>>>Atlanta,GA
Bill,
Cogged belts can causing a constant jaring on the pullies = constant jaring on the bearings.
There was a fellow at Stbrfst that had a cogged pullied SCed car that actually broke the crank bolt off. Not only was it cogged but the SC drive pulley was positioned beyond the alternator pulley by a few inches, near the radiator. The pulley was even cast. IIRC it was a Koning car. If this car has not had a front crank bearing failure then I can't imagine that any SCed car will.
HTH,
Andy K
Cogged belts can causing a constant jaring on the pullies = constant jaring on the bearings.
There was a fellow at Stbrfst that had a cogged pullied SCed car that actually broke the crank bolt off. Not only was it cogged but the SC drive pulley was positioned beyond the alternator pulley by a few inches, near the radiator. The pulley was even cast. IIRC it was a Koning car. If this car has not had a front crank bearing failure then I can't imagine that any SCed car will.
HTH,
Andy K