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930gt-40r's Avatar
 
Join Date: Jan 2007
Location: Boca Raton, FL
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I visit the rev limiter everytime I drive my car- I have it set at 6700 rpm. I think the rockers would be a problem before the rod bolts would be ( at short bursts).
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Kris @ Tech9
86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 03-25-2008, 07:14 PM
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Rod bolts and valve springs need attention if you plan to make a habit of bumping the limit.

It is not uncommon for my engine to nick the limit due to the low gears in the 915. I hate doing it because it is such an ugly sound. Wheel spin in 1st and 2nd reduce the trip from 3000-7200rpm to about 1 second.

My current 915/61 tranny is Wevoized as well. I'm building a Euro 915/63 with a factory oil pump as well and some higher gears. Stout looking pieces on that dude when compared to anything SC and previous.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 03-25-2008, 07:57 PM
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930 engine produces max power at 5500 RPM. After that, it's producing gradually more noise and less power. Old mech limiters could vary their cutout limits and I wouldn't rely on them. Original rod bolts are same stuff as on 3.2 Carrera and survive longer on 930's just beacuse owners don't rev as much as Carrera's. They are still weak link. 3.0's will fare little better beacuse of shorter stroke and lower piston speeds.

So:

Don't do above 6000. 6000+ is uncharted teritory and if your stock limiter is malfunctioning or replaced with non-limiting one or your bolts got wrung to 6800 RPM one time too many you might be hearing very expensive noises.
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Old 03-26-2008, 07:08 AM
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Quote:
Originally Posted by beepbeep View Post
Don't do above 6000. 6000+ is uncharted teritory and if your stock limiter is malfunctioning or replaced with non-limiting one or your bolts got wrung to 6800 RPM one time too many you might be hearing very expensive noises.
Yes, I learned the expensive sound from sitting at 6900rpm lap after lap for ~6 sec at a time for about 1 season on the track

My car was not 100% stock at the time, but the expensive things (i.e. crank, rod, rod bolts, ...) were. And my result: bent valve because of valve float.
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87 930 K27HFS/B&B/Twin-Plug... Megasquirted
Old 03-26-2008, 12:09 PM
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Quote:
Originally Posted by hobieboy View Post
my result: bent valve because of valve float.
Be thankful that is all that happened
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Kris @ Tech9
86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 03-26-2008, 12:39 PM
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Quote:
Originally Posted by 930gt-40r View Post
Be thankful that is all that happened
Oh yes.... could have been MUCH worse though the end result (complete rebuild, EFI, ... ) is not much different

And though an expensive lesson, knowing that an almost stock (engine-wise) 930 can catch/stay with a GT3 is not bad either
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87 930 K27HFS/B&B/Twin-Plug... Megasquirted
Old 03-26-2008, 12:50 PM
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haha,
Its seems that a full rebuild and EFI solves a lot of problems...
But even at that, If it threw a rod then you would have no more motor to work with. Thats why pauter-manly, crower, carrilo rods are awsome- they bend, but dont break therfore saving the rest of the motor.
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Kris @ Tech9
86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 03-26-2008, 04:18 PM
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hey-
Im sorry for hijacking the thread.
I got 3.6 crank, stock pistons, Pauter rods/arp hardware, porsche motorsport valve springs, and GT-2 cams. If anyone has any input as to what I *could* run that motor up to I would like to hear it because I may want to move the rev limiter.
sorry for the hijack
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Kris @ Tech9
86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 03-26-2008, 04:37 PM
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