Is there a benefit to running 1.6 Roller Rockers
Expecting 450-475 at the wheels though my 4000 stall.
The important part is that it should run 11.1xx
N/AThe motor will easily handle very large quantities of N20 later. (IE: once the fuel system and drivetain are upgraded)
Thread Starter
Joined: Apr 2008
Posts: 1,822
Likes: 36
From: Eaton, Colorado
High 23x/24x on a very tight LSA. Custom BRE H/R grind
Expecting 450-475 at the wheels though my 4000 stall.
The important part is that it should run 11.1xx N/A
The motor will easily handle very large quantities of N20 later. (IE: once the fuel system and drivetain are upgraded)
Expecting 450-475 at the wheels though my 4000 stall.
The important part is that it should run 11.1xx
N/AThe motor will easily handle very large quantities of N20 later. (IE: once the fuel system and drivetain are upgraded)
Well under 110*
LSA - Lobe Separation Angle
Tighter angles (lower number) will yield more "chop" from both valves being partially open at the same time.
Typically a good choice for N/A cars, sacrifice a little idle quality for top end power.
http://www.popularhotrodding.com/eng...ion_angle.html
LSA - Lobe Separation Angle
Tighter angles (lower number) will yield more "chop" from both valves being partially open at the same time.
Typically a good choice for N/A cars, sacrifice a little idle quality for top end power.
http://www.popularhotrodding.com/eng...ion_angle.html
I did 1.6's on a stock TPI and it was like a different motor. I was amazed and no joke it took about 4/10's off my quarter when coupled with a shift kit. Now on an LT1 my friend did it to his 94 6-speed and it helped out on the high end. I would say they're good for about 10 horse. Decent mod, pretty cheap too.
TECH Fanatic
Joined: Jun 2007
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From: centerville, ohio
I switched from 1.6 s/a Promags to Scorpion 1.7 nsa earlier this year. My car dyno'd 299 rwhp 330 tq and ran a best of 12.97 with 1.6's. After the swap it dyno'd 309 rwhp 336 tq and ran a best of 12.86. Stock heads and cam.
No because i went straight to a 383 when I did cam and valvetrain. I ran the stock motor procharged for about 6500mi, then it popped a headgasket from a mail order tune. It was not the tune that was the problem, I got someone elses tune in the mail. But that's a whole other story lol. 1.6's should give you 5-10whp gain over 1.5's and the 1.7's should give around 10-15whp over 1.5's
Last edited by kinglt-1; Oct 25, 2008 at 01:42 PM.
Thread Starter
Joined: Apr 2008
Posts: 1,822
Likes: 36
From: Eaton, Colorado
No because i went straight to a 383 when I did cam and valvetrain. I ran the stock motor procharged for about 6500mi, then it popped a headgasket from a mail order tune. It was not the tune that was the problem, I got someone elses tune in the mail. But that's a whole other story lol. 1.6's should give you 5-10whp gain over 1.5's and the 1.7's should give around 10-15whp over 1.5's
I seriously doubt you will see any oil temp changes by using roller rockers..
rockers do not change for cubic inch. they will pretty much be the same no matter what the engine is.
rockers do not change for cubic inch. they will pretty much be the same no matter what the engine is.
Thread Starter
Joined: Apr 2008
Posts: 1,822
Likes: 36
From: Eaton, Colorado
This sounds like a nice mod to do if you dont have a cam swap for the plans. With a 1.6 or 1.7 rr would it be a good idea to change valve springs? and if so does anyone have a set in mind?
Thas what I figured, mine car only has 50k miles on it but I know the stock springs are pretty weak, even for the stock cam. What aftermarket springs do you recommend?