Another L76/L92/LQ4 build...
04-14-2009, 12:23 PM
#1
Another L76/L92/LQ4 build... I search through this forum and found some answers to some question I had. The stickies helped as well.
This will be a stock LQ4 w/ unported L92 heads and a L76 intake in a '01 WS6.
Only two questions:
1) What cam (like you didn't see that one coming, lol). I read a few suggestions: CC XR281HR, LG G6X3, and a 218/224 .605"/.601" 112+0 xfi lobes. What do you recommend?
2) With the 70cc chambers of the L92 heads, how much should the heads be milled taking into account the large valves, a possible high lift cam, and the fact that the LQ4 has dished pistons. I want a compression ratio that will work well with the cam (yet to be determined) and still run well on 91 octane.
This will be a stock LQ4 w/ unported L92 heads and a L76 intake in a '01 WS6.
Only two questions:
1) What cam (like you didn't see that one coming, lol). I read a few suggestions: CC XR281HR, LG G6X3, and a 218/224 .605"/.601" 112+0 xfi lobes. What do you recommend?
2) With the 70cc chambers of the L92 heads, how much should the heads be milled taking into account the large valves, a possible high lift cam, and the fact that the LQ4 has dished pistons. I want a compression ratio that will work well with the cam (yet to be determined) and still run well on 91 octane.
04-14-2009, 05:21 PM
#2
I had to take .030 off mine and I am running .045 gaskets to get 10.8:1
Check how far above the deck you pistons are, that will help with the equation.
You will get at least a dozen answers on the cam question. I paid for a recommendation from PatrickG for a different one for my car. I am not sure if I will do it because the gain isn't big enough over my current cam from what I can tell. But if I was just starting to build one, I would be all over it.
227/235 .617”/.621” 112LSA +2 advance
Comp LSL/LSL lobes
13017R/13019R HR112LSA +2 advance (110 installed intake centerline)
Attached is a excel file I found on here that will help you with the CR.
Check how far above the deck you pistons are, that will help with the equation.
You will get at least a dozen answers on the cam question. I paid for a recommendation from PatrickG for a different one for my car. I am not sure if I will do it because the gain isn't big enough over my current cam from what I can tell. But if I was just starting to build one, I would be all over it.
227/235 .617”/.621” 112LSA +2 advance
Comp LSL/LSL lobes
13017R/13019R HR112LSA +2 advance (110 installed intake centerline)
Attached is a excel file I found on here that will help you with the CR.
04-14-2009, 05:25 PM
#3
I had to take .030 off mine and I am running .045 gaskets to get 10.8:1
Check how far above the deck you pistons are, that will help with the equation.
You will get at least a dozen answers on the cam question. I paid for a recommendation from PatrickG for a different one for my car. I am not sure if I will do it because the gain isn't big enough over my current cam from what I can tell. But if I was just starting to build one, I would be all over it.
227/235 .617”/.621” 112LSA +2 advance
Comp LSL/LSL lobes
13017R/13019R HR112LSA +2 advance (110 installed intake centerline)
Attached is a excel file I found on here that will help you with the CR.
Check how far above the deck you pistons are, that will help with the equation.
You will get at least a dozen answers on the cam question. I paid for a recommendation from PatrickG for a different one for my car. I am not sure if I will do it because the gain isn't big enough over my current cam from what I can tell. But if I was just starting to build one, I would be all over it.
227/235 .617”/.621” 112LSA +2 advance
Comp LSL/LSL lobes
13017R/13019R HR112LSA +2 advance (110 installed intake centerline)
Attached is a excel file I found on here that will help you with the CR.
04-14-2009, 05:44 PM
#4
Mods are in my sig. The only time I went to the dyno with mine, I had a valve spring issue so my numbers came out low, only 390 rwhp. I fixed the issue but I haven't been back on the dyno. According to my Performance Trends software, Patricks cam peaked 10 rwhp higher than mine on the software but the power under the curve improved. I figure I paid for the specs, if I am not going to use it someone else may as well use it.
I ran the 1/4 times in my sig with a 3700 lb car and no traction on street tires plus I was at 96 in the 1/8 so the bad dyno run doesn't tell the whole store on the power.
I ran the 1/4 times in my sig with a 3700 lb car and no traction on street tires plus I was at 96 in the 1/8 so the bad dyno run doesn't tell the whole store on the power.
