KA - In Memory of my Mom (Vincee) and best friend Michael J. Maring
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I spoke with Rob @ S Car Go Racing. I am going to go up to his shop next week to take a look at the motor.
It ought to be interesting. Not many 4.2 liter 996tt's out there. The torque on this motor should overshadow just about everything out there (Porsche's that is) on the street.
It ought to be interesting. Not many 4.2 liter 996tt's out there. The torque on this motor should overshadow just about everything out there (Porsche's that is) on the street.
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Divexxtreme reported on his thread that his intake lift @ 0.432 and 237 degree duration and exhaust lift 0.400 @ 216 deg duration.
We are running a bit more lift and duration on both cams. It is amazing how these motors will vary regarding cam specs.
As a comparison, we are running for the intake about .075 more lift and 60 degrees more duration. The exhaust about .040 more lift and 70 degrees more duration.
We are running a bit more lift and duration on both cams. It is amazing how these motors will vary regarding cam specs.
As a comparison, we are running for the intake about .075 more lift and 60 degrees more duration. The exhaust about .040 more lift and 70 degrees more duration.
Last edited by cjv; Nov 9, 2008 at 04:00 PM.
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Actually it is almost 81.6 mm. The NASCAR oval bearings are smaller than the stock Porsche bearings. While grinding the crank it is offset another .02 mm. Then it is knife edged and lightened, cross drilled, micro polished, nitrated and balanced. The pistons are 105.5 mm.
Last edited by cjv; Dec 26, 2008 at 05:34 PM.
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Wow Chad,
Thats 4.3L. Man you are setting the bar high now. I know Neil has 104.50mm Turbo Pistons and with the 81mm Crank, that makes it a 4.2L but 105.5mm, my gosh thats huge.
These big bore long stroke engines make a very unique sound when on throttle. I wonder what yours will sound like. The 4.2L engines sound so very different. Quite amazing sound if your into engine sounds. It is so easy now to tell who has stock bore size and who has big displacement.
I cannot wait to hear from you what it sounds like. Oh BTW, they go like stink too.
Thats 4.3L. Man you are setting the bar high now. I know Neil has 104.50mm Turbo Pistons and with the 81mm Crank, that makes it a 4.2L but 105.5mm, my gosh thats huge.
These big bore long stroke engines make a very unique sound when on throttle. I wonder what yours will sound like. The 4.2L engines sound so very different. Quite amazing sound if your into engine sounds. It is so easy now to tell who has stock bore size and who has big displacement.
I cannot wait to hear from you what it sounds like. Oh BTW, they go like stink too.
Last edited by cjv; Dec 26, 2008 at 05:32 PM.
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Chad,
The Torque these big engines make is massive. I will be interested to see what you make form this monster. You should even with mild boost make way more than anyone else. Most of the 3.8L engines and some of the 3.9L engines all make around the same. The 4.0L and above make more and along with the engine sound note, the Torque is the other main factor in telling just what they are made of.
Welcome to the club of big displacement. You will not be disapointed.
The Torque these big engines make is massive. I will be interested to see what you make form this monster. You should even with mild boost make way more than anyone else. Most of the 3.8L engines and some of the 3.9L engines all make around the same. The 4.0L and above make more and along with the engine sound note, the Torque is the other main factor in telling just what they are made of.
Welcome to the club of big displacement. You will not be disapointed.
We should be making around 1200 hp @ 1.3/1.4 bar. Remember, this motor is also set up for a 200 shot of nitrous. With the modified head studs, washers, head gaskets along with the dual o-ringed heads and liners...... the boost numbers could be pushed upward north of 2.5 bar.
This motor will be at max torque around 3000 rpm's. I really doubt if we will be doing any off the line starts as the dive train would fail.
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We have modified the drive train. Changed all six gear ratios, billet straight cut teeth, steel syncro's, oil strayer, tranny cooler, solid tranny mounts, GT3 billet rear differential, 993 built front differential, T300 drive line, front and rear LSD, custom front and rear axles. The clutch is a three disc Tilton.
It has all been gone through, however the weakest link will break first and the next would follow. I really don't know how to make the drive train handle it from a standing start.
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Now for Sale - Serious Offers Only - Over 12K spent to have designed/built - No longer need - Replaced with stroker crank and rods.
One new GT3R crank which has been ground for 2.0" NASCAR Oval Bearing, Cross drilled, micro polished, knife edged, nitrated and balanced.
One new set of custom billet Pauter rods to match the above crank for NASCAR oval bearings.
One new GT3R crank which has been ground for 2.0" NASCAR Oval Bearing, Cross drilled, micro polished, knife edged, nitrated and balanced.
One new set of custom billet Pauter rods to match the above crank for NASCAR oval bearings.
Last edited by cjv; May 11, 2010 at 10:35 PM.