Upgrade camshafts
#108
I know this. But I'm not going to type out the entire measurements when I can just say 272 and anyone with common knowledge would know your taking about aggressive cams. Unless your taking v8. Then I should just say aggressive cams. My bad.
Meanless, no though, very important.
Turbo= high duration/short lift
N/A= short duration/high lift
Correct? Simplified
Also I like ******.. but no seriously.
I've looked into cams and have supertek double springs, solid under shim as the setup. Which would be marvelous for 8k red line.
Meanless, no though, very important.
Turbo= high duration/short lift
N/A= short duration/high lift
Correct? Simplified
Also I like ******.. but no seriously.
I've looked into cams and have supertek double springs, solid under shim as the setup. Which would be marvelous for 8k red line.
#114
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Longer duration is a necessity when an engine is operating at high rpm, regardless of it being naturally or force aspirated. In the case of being supercharged or turbocharged you typically would need less duration to get the same affect because of the positive pressure, but it has a lot more to do with the engines speed than anything. More revs means less time for cylinder filling and evacuation to happen, which means you need more duration.
Lots of duration comes with added effects on valve timing (late intake valve closing in particular) which are often really bad for turbo engines. So if anything I would say that its the exact opposite of what this builder told you.
Turbo cams usually use high lift to get the flow that they cant get from long duration. Ive even heard of people buying turbo specific cam grinds and actually losing peak power because the grind has less duration than stock (with more lift and an advanced intake profile). They gain spool and a lot of mid range, but up at high rpm the cams lowered duration makes the engine run out of breath.
#116
Maybe it's a Honda thing. Or he was just talking out his ***. He also sarcastically said gridlock with my Wiseco pistons.
Short duration seems more oriented to boosted cars, like you said, since the air is being forced in it should need a long.
So, just run massive duration/lift for ALLOFIT
Ctdrftna, your cans were custom weren't they? Remember the specs?
Short duration seems more oriented to boosted cars, like you said, since the air is being forced in it should need a long.
So, just run massive duration/lift for ALLOFIT
Ctdrftna, your cans were custom weren't they? Remember the specs?
#118
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CT, your cams seem like a good match for my all motor build. we should chat.
you would have had to clearance the head, but did you have any problems with standard valve guides being too long with that much intake lift?
you would have had to clearance the head, but did you have any problems with standard valve guides being too long with that much intake lift?
#119
The head is clearanced, I'm running the supertech dual springs without the inner spring, and a .015 shim to get my spring pressure right. I have bronze guides , but I don't think they are any different dimensionally from stock. I know I'm close on retainer to seal clearance. But iv had no problems with these cams.
I did replace a few mazda comp lifters over the winter because they had some funny marks on the top . Looked like the chrome playing came off or something.
I did replace a few mazda comp lifters over the winter because they had some funny marks on the top . Looked like the chrome playing came off or something.