What is the safest cam duration to run with injected headers? Large duration or small? WTdevil
[email protected] .050 intake 240 exhaust 252I think overlap and lsa have more/as much, to do with it. What cam are you lookin at???
Do a search for cam duration, 71 hallett started a thread with alot of good info, I'd post a link but I'm too stupid.
Some of the things that raise my eyebrow:[email protected] .050 intake 240 exhaust 252
lobe lift .3780 .3600
Dur. @ .006 .297 .317
Gross valve lift .643 .612
Degree intake lobe to 108
I don't believe you are going to get away with this cam with headers that inject the water right under the port. How old id this cam? Seems like a lot of ad (.006")duration for only 252 @ .050
You're obviously in the wrong business. You should be designing cams.You are obviously concerned about water reversion since this is the second thread you started on this subject. 1st is located here:
There, you mentioned using exhaust manifolds.
I have questions about this cam since you are so concerned about reversion #1, and #2 it just doesn't add up any which way I put a scenario to it:
1) What where the particulars and concerns when you bought / had this made ?
2) What was the reasoning behind grinding the cam with the specs it has ?I still have not seen nor been answered on the rest of this engine's build. I've just seen exhaust and cam info.
I am not the only asking as to why the cam is the way it is ?
Some of the things that raise my eyebrow:
-Why the 113°LSA ? To cut down on overlap ? Still, the overlap is huge for what the cam is vs what it could be with same .050" .
-This cam has 81° of overlap at .006" seat. That's big folks - and remember it has 113 LSA (ie:wide) and 240°/252° at .050.
-The intensity is very large at 65°.
-The i/e split is 20° at seat.
- 317° at .006" to only raise the valve .612" with a 1.7 rocker.
Offshore manifolds won't be better. It (manifolds) would have to be completely dry and either have water exit well outside the exhaust tip or the collectors/tubes be at an extremely large rate of fall with the water at the very end.I only brought it up because I don't believe that cam is going to be wet header friendly. Perhaps with the right offshore type manifolds, but not an injected header. Cam appears at first glance to be very easy on the valve train.
just saying that it may require a little thought as to how the exhaust was build to avoid problems. But have also ran more .050 with no trouble. It's all in the exhaust design.Me not being the brightest bulb in the room :Laugh:, what did you mean ?