GPI SS4 Custom VVT Grind on my car - Page 3 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

thahemp · 10-26-2013, 10:10 PM

Rhino, about how deep into the LS3 pistons would you expect to have to cut to clear the SS4? I'm getting close to this step.

Rhino79 · 10-27-2013, 09:27 PM

That is a good question hemp. Intake side will need .035" or so out, exhaust side, I don't know, I haven't measured it on a flat top to see. Its going to need a lot because as the cam retards it will tighten up on the exhaust ptv. The factory piston has a large relief and Im worried cutting that much on the ls3 would make it too weak on the exhaust relief. I don't know the piston head thickness.

Rhino79 · 10-28-2013, 01:12 AM

Oh by the way, this cam just pushed my car 10.75@126.33 in positive da!

Kyle2k · 10-28-2013, 10:04 AM

Quote:

Originally Posted by Rhino79

Oh by the way, this cam just pushed my car 10.75@126.33 in positive da!

Good lord!

litle88 · 10-28-2013, 10:11 AM

Nice!

Rhino79 · 10-28-2013, 10:19 AM

And 9.99 on the spray...lol.

thahemp · 10-28-2013, 12:24 PM

Quote:

Originally Posted by Rhino79

That is a good question hemp. Intake side will need .035" or so out, exhaust side, I don't know, I haven't measured it on a flat top to see. Its going to need a lot because as the cam retards it will tighten up on the exhaust ptv. The factory piston has a large relief and Im worried cutting that much on the ls3 would make it too weak on the exhaust relief. I don't know the piston head thickness.

I can't find much on LS3 piston thickness. I found this quote from SpinMonster over on the corvette forums.

"The surface of the stock hypereutectic piston is at its thinnest section 220 thousandths. In most places its over .330” and some its .4”."

He seems to be the goto guy for fly cutting info/tools. So that's .220" near the ring lands, and a little more everywhere else. Are you thinking "a lot" as in... .080" or "a lot" as in .120"? I have seen that it is not recommended to cut any deeper than .1".

Congrats on the new times. That's getting to be pretty damn fast.

axis · 10-28-2013, 12:46 PM

Wow, that just put a HUGE gap in the power adders list.

Way to go Ryan.

litle88 · 10-28-2013, 01:20 PM

Way to go rhino.

1989GTA · 10-28-2013, 02:03 PM

Quote:

Originally Posted by Rhino79

Oh by the way, this cam just pushed my car 10.75@126.33 in positive da!

Can you update the modifications to your car or is the cam the only change? Those are fantastic numbers.

Muddflap · 10-28-2013, 02:05 PM

Quote:

Originally Posted by 1989GTA

Can you update the modifications to your car or is the cam the only change? Those are fantastic numbers.

His cam is the only thing that is new.

JEFF75645 · 10-28-2013, 02:58 PM

Hey Muddflap, I ordered the new cam today.

SSeniorMoment · 10-28-2013, 09:01 PM

I like "Oh by the way"!

Rhino79 · 10-28-2013, 09:03 PM

Quote:

Originally Posted by 1989GTA

Can you update the modifications to your car or is the cam the only change? Those are fantastic numbers.

On the motor the cam is the only difference. Except I'm running colder plus for the spray. In negative da I think it will run a low 60 or high 10.50 with the posi right.

10-26-2013, 10:10 PM	#29
thahemp Geek Drives: 2012 Black LS3 Join Date: Jan 2012 Location: Derby, KS Posts: 4,343 View My Garage	Rhino, about how deep into the LS3 pistons would you expect to have to cut to clear the SS4? I'm getting close to this step. __________________ 01000111011011110110111101100100001000000110110001 11010101100011011010110010000001110111011010010111 01000110100000100000011101000110100001101001011100 110010000001101111011011100110010100100001 x = ac97968bd3df8f968c8cd3df998a9c94d3df9c8a918bd3df9c 909c94df8c8a9c949a8dd3df92908b979a8ddf998a9c949a8d d3df8b968b8cd1 x = ~x

10-28-2013, 10:11 AM	#33
litle88 V8 Lounge member #2 Drives: 2001 Ws6 Join Date: Sep 2009 Location: Burbank,IL Posts: 6,373	Nice! __________________ 2001 ws6, 40k miles, Ls3 416 stroker, short block built by PER the rest by me. LPE Ls3 heads milled to 12-1 comp, FAST 102, NW 102, kooks 2", dual DMH cutouts, Magnaflow C/B, BTR cam + springs. Full UMI suspension.

10-28-2013, 12:46 PM	#36
axis Search Ninja Drives: 2010 Black 2SS/RS A6 Join Date: Oct 2009 Location: Central Ark Posts: 7,183	Wow, that just put a HUGE gap in the power adders list. Way to go Ryan. __________________ 2010 Black 2SS/RS A6 Halltech CF 102 fed GPI modded intake manifold Bo (knows) White ported TB Kooks LT's/ Dynomax VT Pfadted (springs/sways) Dyno tuned by Rhino and GPI I once parallel parked a train.

10-28-2013, 01:20 PM	#37
litle88 V8 Lounge member #2 Drives: 2001 Ws6 Join Date: Sep 2009 Location: Burbank,IL Posts: 6,373	Way to go rhino. __________________ 2001 ws6, 40k miles, Ls3 416 stroker, short block built by PER the rest by me. LPE Ls3 heads milled to 12-1 comp, FAST 102, NW 102, kooks 2", dual DMH cutouts, Magnaflow C/B, BTR cam + springs. Full UMI suspension.

10-28-2013, 02:58 PM	#40
JEFF75645 Drives: his wife crazy buying mods Join Date: May 2012 Location: Gilmer, TX Posts: 1,342 View My Garage	Hey Muddflap, I ordered the new cam today. __________________ Gone But Not Forgotten

10-27-2013, 09:27 PM	#30
Rhino79 Drives: 2010 Camaro SS L99/Auto Join Date: Jul 2011 Location: Cabot, AR Posts: 2,827 View My Garage	That is a good question hemp. Intake side will need .035" or so out, exhaust side, I don't know, I haven't measured it on a flat top to see. Its going to need a lot because as the cam retards it will tighten up on the exhaust ptv. The factory piston has a large relief and Im worried cutting that much on the ls3 would make it too weak on the exhaust relief. I don't know the piston head thickness.

10-28-2013, 01:12 AM	#31
Rhino79 Drives: 2010 Camaro SS L99/Auto Join Date: Jul 2011 Location: Cabot, AR Posts: 2,827 View My Garage	Oh by the way, this cam just pushed my car 10.75@126.33 in positive da!

10-28-2013, 10:19 AM	#34
Rhino79 Drives: 2010 Camaro SS L99/Auto Join Date: Jul 2011 Location: Cabot, AR Posts: 2,827 View My Garage	And 9.99 on the spray...lol.

10-28-2013, 09:01 PM	#41
SSeniorMoment Drives: 2010 2SS/RS LS3 A6 IOM Join Date: May 2013 Location: Arizona Posts: 1,192	I like "Oh by the way"!