Alternating Roller Rocker Ratios
Alternating Roller Rocker Ratios Has anyone tried installing alternating roller rockers with 2 different ratios on their LT1? Meaning like
1.6s on intake and 1.5s on exhaust or
1.5s on intake and 1.6s on exhaust or
1.7s on intake and 1.6s on exhaust or
1.6s on intake and 1.7s on exhaust
Well, you get the idea. If anyone has tried this please post gains or loses in power, ET, etc. Thanks
1.6s on intake and 1.5s on exhaust or
1.5s on intake and 1.6s on exhaust or
1.7s on intake and 1.6s on exhaust or
1.6s on intake and 1.7s on exhaust
Well, you get the idea. If anyone has tried this please post gains or loses in power, ET, etc. Thanks
Last edited by LT14LIFE JT; Sep 29, 2007 at 06:15 AM.
Launching!
Joined: Sep 2007
Posts: 245
Likes: 1
From: Clover, South Carolina
Used to back in the older days on the BBC's. Good power could be made by opening up the exhaust more than the intake. Obviously what modifications have been done determine what makes good power. Sorry, can't tell you on this specific engine.
I had 1.5 intake 1.6 exhaust on my 91z. I bought it like that though. Not sure if it helped or not. But the car was a 305 and went mid 14's all day with rocker, slp runners, 3.73's and a catback.
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Different rocker ratios will let you easily experiment to see what the car likes.
This will not correct a poor cam choice, nor is it meant as a substitute for a cam swap, this is strictly a tuning tool, to help find some minor power gains.... it could gain a few HP (or potentially lose power) on the average application.
This will not correct a poor cam choice, nor is it meant as a substitute for a cam swap, this is strictly a tuning tool, to help find some minor power gains.... it could gain a few HP (or potentially lose power) on the average application.
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No aftermarket cam here. I'm running a bolt on LT1 and will continue to. I was just curious about it. I thought maybe somebody on here had tried it and I just wanted to see if it was worth my time to do try it or not. It can't hurt to try though.
well if it helps, i played a bit on my carb small block in my tacoma and i did 1.6 RR on exhaust... i picked up about 8hp on the nitrous, but i think i got about 2hp n/a. could have been other variables as well, but that was on a stock cam. maybe that would help?? trial and error and keep us posted on your findings
Ive used stock 1.5's on intake and 1.6's on exhaust. This was a SI bolt on with 150 shot of nitrous. I got better gas mileage during everyday driving. And I dynoed before and after. I picked up 12 rwhp on motor. On spray 1.5, 1.5 132 rwhp gain on 1.5, 1.6 149 rwhp gain. My new heads will be done this week. Im running 7/16 studs with 1.6 intake and 1.7 exhaust.
Ive used stock 1.5's on intake and 1.6's on exhaust. This was a SI bolt on with 150 shot of nitrous. I got better gas mileage during everyday driving. And I dynoed before and after. I picked up 12 rwhp on motor. On spray 1.5, 1.5 132 rwhp gain on 1.5, 1.6 149 rwhp gain. My new heads will be done this week. Im running 7/16 studs with 1.6 intake and 1.7 exhaust.
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Joined: Feb 2008
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From: I moved to over there
I went 8.99 with a Camaro LT1 in a truck with 1.5, put 1.65 and went 8.84. LT1's seem to respond to more lift on a stock cam.
Would I do 1.65 again? NO! I would change cam so like they say too much of a good thing might be too much
Would I do 1.65 again? NO! I would change cam so like they say too much of a good thing might be too much
Launching!
Joined: Dec 2004
Posts: 284
Likes: 1
From: Hebron, Oh
I use 1.6 on the intake and 1.52 on exhaust with a ZZ4 cam. I wanted to bring the intake lift up a bit, came to 506/516. Ran this setup since I put the cam in, so don't know if it makes a difference.
I have 1.65 on the intake and 1.5 on the exhaust. Times in signature. No since of opening the exhaust valve any more then you have to. Not to mention by opening the exhaust valve more you are running risk of bring the valve closer to the piston on the exhaust stroke.