Cams
- Thread starter AXXE
- Start date
Dan_Austin
Member
During a recent rebuild I went with the 412. I wanted a daily driver with a bit more punch, and that describes it well, even a bit too well. I suspect a 415 would have also met my goals and I likely could have lived with a 422. Did you have vortec heads, and a higher flowing turbo? Without improving flow restrictions a more aggressive cam MIGHT perform poorly compared to a less aggressive.
graham1524
Well-known member
I've got the Steve Morris cam and it's been good. The comp 422 is a whole lot cheaper.
An old ty owner used to work for him and did some good testing on his truck when making it.
An old ty owner used to work for him and did some good testing on his truck when making it.
DaveP's Ghost
Well-known member
Phil: How did that cam respond at low RPM, before boost built? I would expect kind of lethargic, especially with the low compression turbo engines should have.
I've never seen a cam with 0 deg of overlap. The exhaust closes at exactly the same time the intake opens. 6 deg AFTC. On the other hand that cam is 'bigger' in both lift and duration over anything I've used in SyTy.
I looked at the sheets for the two custom cams I've had ground for my Syclones. The first one was a single pattern done 20+ years ago for the Sy I still own, but have never driven. The other was for DesertSy and is the same pattern on the exhaust, but I increased both lift and duration on the intake, and pushed the LSA up another degree as 'thinking' regarding turbo engine cam profiles had changed in the ensuing 12 years between the two builds. DesertSy had a stock turbo, stock calibration and had to pass Cali Emissions or I may have gone bigger. It ran well enough. It had good idle quality and good low boost torque.
I've never seen 0 overlap. Maybe I didn't read it right.
Cheers
I've never seen a cam with 0 deg of overlap. The exhaust closes at exactly the same time the intake opens. 6 deg AFTC. On the other hand that cam is 'bigger' in both lift and duration over anything I've used in SyTy.
I looked at the sheets for the two custom cams I've had ground for my Syclones. The first one was a single pattern done 20+ years ago for the Sy I still own, but have never driven. The other was for DesertSy and is the same pattern on the exhaust, but I increased both lift and duration on the intake, and pushed the LSA up another degree as 'thinking' regarding turbo engine cam profiles had changed in the ensuing 12 years between the two builds. DesertSy had a stock turbo, stock calibration and had to pass Cali Emissions or I may have gone bigger. It ran well enough. It had good idle quality and good low boost torque.
I've never seen 0 overlap. Maybe I didn't read it right.
Cheers
wildphil
I Love My Ty's
Dave, Camshaft design is something that I know almost nothing about. By looking at the cam card it does look like it would be zero overlap. It was designed by a person I talked to at Comp Cams. I don't know what that is worth.
The truck seemed to run well when it was not under boost. Starting from a stop seemed pretty normal to me. Now I never got the truck lined out after I put the engine in it at WOT before I sold it. Took it to the track one time. I don't recall the exact time but it ran in the 12's(Very slow for what it should have}. But the mph was 121. It was quite slow at the start of the run but ended surprisingly strong.
The truck seemed to run well when it was not under boost. Starting from a stop seemed pretty normal to me. Now I never got the truck lined out after I put the engine in it at WOT before I sold it. Took it to the track one time. I don't recall the exact time but it ran in the 12's(Very slow for what it should have}. But the mph was 121. It was quite slow at the start of the run but ended surprisingly strong.
DaveP's Ghost
Well-known member
121 MPH at 3,400 pounds is 340 net horsepower. That's net after drivetrain, alternator, and other losses. Not bad.