Torque cam
Torque cam Sold my cc305. Ordering a lloyd elliot cam instead. How does a 215/224 .533 .533 lift, 112LSA cam sound good for low mid range power up to 5500rpm? Im going with lower lift because my gm hotcam rr's have a max lift of .575.
A cam with less overlap, the amount of time the exhaust valve stays open while the intake valve begins to open, will have better low end power than a cam with more overlap.
A cam with an intake center line less than the love separation angle will have advance ground into it and better low end power.
The best person to tell you how the cam will act though will be Lloyd himself. Typical cam specs will tell you only part of the story about how a cam will perform.
A cam with an intake center line less than the love separation angle will have advance ground into it and better low end power.
The best person to tell you how the cam will act though will be Lloyd himself. Typical cam specs will tell you only part of the story about how a cam will perform.
Joined: May 2004
Posts: 1,593
Likes: 267
From: Halfway back on the Highway to Hell...again!
I can't remember my specs exactly, but the cam in mine makes way too much tq for my liking. The motor is a 383 though. Cam motion did a custom grind. I said I wanted something to get a 4200lbs car off the line. I guess they thought I said pull Mt Everest.
If I remember when I get home, I'll post up the specs. It's not that big, just a torquey sumbitch.
If I remember when I get home, I'll post up the specs. It's not that big, just a torquey sumbitch.
TECH Addict
Joined: Dec 2010
Posts: 2,610
Likes: 4
From: Maricopa, AZ
Cam specs, as we know them are poor descriptors......
There's a lot more to a cam than duration and max lift and LSA+Advance. Everything listed on an advertisement for a cam is a result of SOME of the cam specs.
What you really want to know is the 4 valve timing events (IVO, IVC, EVO, EVC), the ramp profiles, and the peak lift and where that peak lift occurs.
IVO (Intake Valve Open) is something you want to know in relation to EVC (Exhaust Valve Close) and piston location, this has a direct effect on scavenging.
IVC (Intake Valve Close) in relation to piston location affects effective (some call this dynamic -DCR) compression ratio. In other words, this directly effects BMEP at lower RPM. The sooner this happens, the more TQ at lower RPM you'll have. But, this will also limit your SCR and RPM. A later IVC event lowers the DCR, which if applied correctly (high SCR, more valve over lap) can increase top end power with little loss in low end torque.
EVO (Exhaust Valve Open), there's not much concern over this. Too soon and it doesn't let the piston fully extend under expansion, too late and the piston is pushing against the expanding pressure. Both will lower BMEP.
BMEP (Brake Mean Effective Pressure) is what you're after. The higher the better. But, to achieve this at certain RPMs will lower it, through other means, at other RPMs.
There's a lot more to a cam than duration and max lift and LSA+Advance. Everything listed on an advertisement for a cam is a result of SOME of the cam specs.
What you really want to know is the 4 valve timing events (IVO, IVC, EVO, EVC), the ramp profiles, and the peak lift and where that peak lift occurs.
IVO (Intake Valve Open) is something you want to know in relation to EVC (Exhaust Valve Close) and piston location, this has a direct effect on scavenging.
IVC (Intake Valve Close) in relation to piston location affects effective (some call this dynamic -DCR) compression ratio. In other words, this directly effects BMEP at lower RPM. The sooner this happens, the more TQ at lower RPM you'll have. But, this will also limit your SCR and RPM. A later IVC event lowers the DCR, which if applied correctly (high SCR, more valve over lap) can increase top end power with little loss in low end torque.
EVO (Exhaust Valve Open), there's not much concern over this. Too soon and it doesn't let the piston fully extend under expansion, too late and the piston is pushing against the expanding pressure. Both will lower BMEP.
BMEP (Brake Mean Effective Pressure) is what you're after. The higher the better. But, to achieve this at certain RPMs will lower it, through other means, at other RPMs.
^^^x2
If you talked to Lloyd and told him what you're looking for I would go with his suggestion without doubt. He is more qualified and knows more about designing an appropriate cam given a particular setup/needs etc. than anyone who is likely to post here.
If you talked to Lloyd and told him what you're looking for I would go with his suggestion without doubt. He is more qualified and knows more about designing an appropriate cam given a particular setup/needs etc. than anyone who is likely to post here.
