Is there a benefit to running 1.6 Roller Rockers
10-23-2008, 10:05 PM
#21
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)
10-23-2008, 10:22 PM
#22
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)
10-23-2008, 10:34 PM
#23
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
10-24-2008, 11:09 AM
#25
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.
10-25-2008, 01:17 PM
#31
TECH Fanatic
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.
10-25-2008, 01:36 PM
#32
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; 10-25-2008 at 01:42 PM.
10-26-2008, 10:53 AM
#33
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
10-28-2008, 01:45 PM
#36
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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?
10-28-2008, 03:19 PM
#38
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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?