Feedback about roller camshafts

Sweet6

Well-Known Member
I run scorpions on my GN1s for 8 years no problems. The shaft mount T&Ds are nice. They just cost a lot more. When I last looked they were $800 and that was years ago. Not sure what they cost now.
 

TIMINATOR

Active Member
HARLAND SHARP.
LIFETIME WARRENTY.
Bought 2 sets. Not building a backup engine, as I got too good an offer to pass up for the car. I'll split the shipping. Still in original packing. 1.65 ratio.
TIMINATOR
 

WarWagon

Caustic Cacophony
I really like the TA performance/T&D roller rocker arms, came with everything to install and solid shafts. I use the 1.65 ratio on my 206 comp roller cam.
 

modular46

Member
What does everyone's car idle at with a roller cam? Right now I can get my stock motor with 120 pound injectors to idle at 800 rpms. Just curious if its possible to get a cammed car under 900?
 

BEATAV8

The Engine Whisperer
What does everyone's car idle at with a roller cam? Right now I can get my stock motor with 120 pound injectors to idle at 800 rpms. Just curious if its possible to get a cammed car under 900?
There’s a trade off between overlap and richness. More overlap will require a richer idle in order to be stable, as well as more speed. More displacement and more static compression helps idle too.
850-900 rpm is pretty typical.
950rpm on a 109 with 224/224 on a 110lsa with 160’s. E85 @ 8.5afr Choppy but stable
850rpm on a 109 with 215/220 on a 112lsa with 120’s. E85 @ 8.5afr Smooth
850rpm on a TA block with 225/225 on a 114lsa. 160’s E85 8.5afr smooth
 
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