- Joined
- Jul 30, 2009
- Messages
- 191

It is very interesting reading about the cam timings. I have done a lot of fiddling with Triumphs with different cams. I have made alterations and felt the differences they made.
What I would like to know is if the PW 3 cam will produce more power(at higher engine speeds) than the standard cams in an engine with only 8.5 or 9 to 1 pistons? Is it suitable for this use. My friend has a 750 with a PW3 cam and 9:1 pistons. It doesn't seem to be any faster than my 850, which is pretty much standard except it has only a single 38 mm carb which should make it slower. I always thought the reason his bike was slow was because the PW3 was really meant to go with 10 or 10.5 :1 pistons.
Do you think my friend has his cam timing wrong? If his bike should be faster we could just look down the exhaust port with the pistons at TDC to see if he has the timing in the right ballpark. Maybe we will be able to see that his exhaust is open more than the intake and so he just needs to make some adjustments.
It may be also a problem of fuel flow. I know he has huge main jets. It may be the the float needles are not passing enough gas to keep up at the higher speeds.
What I would like to know is if the PW 3 cam will produce more power(at higher engine speeds) than the standard cams in an engine with only 8.5 or 9 to 1 pistons? Is it suitable for this use. My friend has a 750 with a PW3 cam and 9:1 pistons. It doesn't seem to be any faster than my 850, which is pretty much standard except it has only a single 38 mm carb which should make it slower. I always thought the reason his bike was slow was because the PW3 was really meant to go with 10 or 10.5 :1 pistons.
Do you think my friend has his cam timing wrong? If his bike should be faster we could just look down the exhaust port with the pistons at TDC to see if he has the timing in the right ballpark. Maybe we will be able to see that his exhaust is open more than the intake and so he just needs to make some adjustments.
It may be also a problem of fuel flow. I know he has huge main jets. It may be the the float needles are not passing enough gas to keep up at the higher speeds.