mykdiver

TTT

XLR8NSS

iTrader: (4)

Hey mykdiver

I don't know the answer to all your questions but, I'll answer the one I do know. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

The T1 can be bought from MTI. Others have cams with similiar specs but, its originally a MTI grind.

422 refers to the size of a motor. I'm getting parts together to build a 422 cubic inch motor. It has a 4.1" bore and 4" stroke.

Thats all the help I can give.

<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

John

mykdiver

TTT

mykdiver

I am learning this whole cam thing, and have some qusetions.
With the mods listed in my sig what is a good cam choise for me? My car is a daily driver, and weekend drag racer.
Where do I get this T1 cam?
How is gas mileage affected?
What are the HP and Torque gains from this cam over my car with my mods?
What is 422?

mykdiver

Thanks.

VAP

I haven't noticed anyone talking about Crane Cams - Do they not offer cams for the LSx engine ?
Has anyone any results using a Crane cam ? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

J-Rod

Ok, I have a few questions also

The stock LS1 cam is .500/.500 198/208.
The 2001 LS6 cam is 0.525/0.525 204/211.
The 2002 LS6 cam is .551/.547 (I didn't have the duration figures)

.500 lift @ 1.7 is .294 at the cam. With a 1.8 rocker it is .529 . With a 1.85 .544 and with a 2.0 rocker it is .588
.525 lift @ 1.7 is .308 at the cam. With a 1.8 rocker it is .555 . With a 1.85 .571 and with a 2.0 rocker it is .617

Ok here are the Cam specs on the MTI cams (from their website) complete with Lift, duration, and lobe separation.

Cam Lift Duration LobeSeparation
Intake Exhaust Intake Exhaust
A1 .532 .558 209 216 114
B1 .558 .558 221 221 114
C1 .566 .566 .222 .222 112
T1 .558 .558 221 221 112
R1* .560 .560 232 237 114
Here is my question. It has been my experience that adding a higher ratio rocker arm will pick up lift (obviously). And usually the increase in ratio is worth about 2-4 degrees of duration per point (this varies with ramp speed). So , I was wondering if some folks had played with big ratio rockers and good springs rather than a total cam swap, and what those results were. I did some of the math, and thought I would post it here...

A stock LS1 Cam
.500 lift @ 1.7 is .294 at the cam.
1.8 .529
1.85 .544
1.9 .558
2.0 .588
2.1 .617

.525 lift @ 1.7 is .308 at the cam.
1.8 .555 .
1.85 .571
1.9 .586
2.0 .617
2.1 .648

On the 2002 Z06 Cam
.525-in. lift to .551-in lift on the intakes
.525-in. lift to .547-in lift on the exhaust

which translates to

.324 intake lift at the cam

Here is what bigger rockers get you
1.8 .583
1.85 .599
1.9 .615
2.0 .648
2.1 .680

.321 exhaust lift at the cam
1.8 .579
1.85 .595
1.9 .611
2.0 .643
2.1 .675

supposedly 116 degree lobe separation

Jesel PN#'s for LS1/LS6 (I believe this is the PN's for their hardcore race setup, not the newer less expensive stuff)
1.7 K2A-3012203
1.9 K2A-3022203
2.0 K2A-3032203

Current Racers net price on the Jesel setup is is 1416.00 (Obviously you can get it cheaper somewhere)

As I said, the increase from 1.7 to 1.8 should give you between 2 and 4 degrees more duration. I am unsure how linear this relationship is, or how much you gain with rockers of an even larger nature. Obviously as stated more is not necessarily better, but I was wondering if folks had played with this. If your port goes turbulent at .580 a .617 lift cam isn't going to do you any good. I was just wondering for instance how a 2002 Z06 cam with some 1.8s or 1.9s (since that is the cam my car has) vs say a T1/B1 with 1.7s might stack up. Obviously the Z06 will idle better, I'm just wondering how power will be. I wondered how this might fare and whether it might be a decent "sleeper" setup.

As a side note. On the springs for the 2002 the closed seat loads are the same 90lbs closed on the seat as 2001 - but the open loads increase from 259lbs in 2001 to 294lbs for both springs in 2002. Obviously as you increase lift, duration, and rpm load on springs become the big thing. So you are at the limits of the stock springs with the factory rockers. I just thought I might throw this out there as another possibility...

Trevor @ Texas Speed & Perf.

iTrader: (3)

VAP - Crane does make a few LS1 cams, but they're not making many. The first aftermarket cam I ever tried in an LS1 was by Crane, and it was a BIG one! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> 208/216, .500"/.500", 114 LSA This was back in September of '99, and I couldn't find ANYONE that had tried an aftermarket cam in an A4 LS1. Since the T/A was still my only mode of transportation at that time, I went really small. It was so small that I gained 0 HP from it but picked up a whopping 15 lb./ft. of torque at the wheels. I wouldn't mind running this cam in my truck! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

LS1derfull

JRod, FWIW increasing basically lift only with stock heads wont gain much, because heads become turbulent around .500" valve lift. Porting cleans this up. Hi ratio rockers dont add enough extra duration to make worthwhile power gains, with stock cam and heads.

J-Rod

Whoops, sorry...

I left out one of the parts of my question, probably the most important part. I have a stock 2002 Z06. I was wondering what gains might be seen with a set of ported LS6 heads and using some larger ratio rockers. It seems like with just a set of rockers you are near the figures of many of the aftermarket cams.

Yes, you are actually bigger in lift, and slightly less in duration, and it has a 116 LSA vs many of the 112 and 114 setups seen in aftermarket cams. It seems like many folks have not found lots of lift to not be the hot setup. I just wondered if anyone might have tried this and had some dyno figures to show what gains (if any) they saw.

Sorry I didn't make my question clear.

mykdiver

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by mykdiver:
<strong>I am learning this whole cam thing, and have some qusetions.
With the mods listed in my sig what is a good cam choise for me? My car is a daily driver, and weekend drag racer.
Where do I get this T1 cam?
How is gas mileage affected?
What are the HP and Torque gains from this cam over my car with my mods?
What is 422?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Can anyone shed some light on these questions?

CySevans

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by mykdiver:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by mykdiver:
<strong>I am learning this whole cam thing, and have some qusetions.
With the mods listed in my sig what is a good cam choise for me? My car is a daily driver, and weekend drag racer.
Where do I get this T1 cam?
How is gas mileage affected?
What are the HP and Torque gains from this cam over my car with my mods?
What is 422?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Can anyone shed some light on these questions?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You can find out about both the "422" and the T1 cam here:

http://www.motorsporttech.com/

As far as HP and torque, it varies from car to car because not all cars are the same from the factory. Without headers, maybe 20-30 additional RWHP give or take? And mileage would be worse, of course, because the tendancy to mash the gas peddle is greater. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

<small>[ April 24, 2002, 04:47 PM: Message edited by: CySevans ]</small>

TAMUz06

Is anyone also discussing the need for a lifter swap with some of these higher (G5) lift cams? I'm about to swap the stock cam outta the Z06 and would really rather not pull the heads and swap lifters, too <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

mykdiver

Thanks "CySevans" <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" /> for the info.

AzzHauler

iTrader: (3)

Has anyone tried using cams with similar intake duration:exhaust duration ratios as stock. A friend of mine proposed this idea, so I started crunching some numbers. I used my stock 98 cam as a base, and figured all the ratios from it(ID:ED, IL:EL, ID:IL, and ED:EL). The duration:duration and lif:lift ratios for 98 and hotcam were all very similar. The 02 ls6 cam was different, and it was the only one with more intake lift than exhaust lift. The duration:lift changed due to the bigger cams. I also made up a few, to see what the cam worked out to if I started with say, a given intake duration and applied all the ratios to it to come up with a cam. I looked through raughammer's cam list for some comparisons. The ARE 226/234 cam followed similar lines, as did the comp 212 and 218 cams. Although the comp ones narrowed the split a little more, and were almost identical as far as the ratios went.

So has anyone tried cams following those rules? I came up with a 224/233 .557/.557 cam based on the 98 cam ratios. I bet that would idle like a champ on a 112-111 lsa. <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

Nine Ball

iTrader: (38)

oldie but a goodie

Brandon Boomhauer

iTrader: (10)

ahhhhhhhh html crap
can i edit that out, and delete a few useless posts?
such as ones like #134?