ok there are a few cams on the market has anyone ran all of them i know people say different about cams but havent really tried them. post what you'd recommend and why

I've personally ran the BPS...EVT 493f...the old cheetah cam and Hoyt's cam.

The cheetah cam is great on the top end....Sucks BADLYon the bottom. It idles rough as hell and has absolutely no holeshot power. It's designed to pull hard to about 7000 rpm.

The BPS cam is great on top end...also has great mid range. Bottom end is lousy but nowhere near as bad as the cheetah. It's designed to pull to around 5000 rpm.

The EVT 493F cam and Hoyts cam are somewhat similar. Both have superior bottom end (holeshot) and mid range and pull hard to around 4600-4700 rpm. The smooth idle associated with these cams is the smoothest of them all.

i think im going to go with the evt and see what happens i guess

ive only had the bps cam and the holeshot was a beast and pulled pretty hard all the way through the rpms.

i have one but one of the lobes has a little triangle at the top.....wierd

The 493f cam is not a welded cam DB8.

Wow whos cam

Got a question.

Are all the lobes on the cam the same height? would a cam with .025" height difference on one cylinder cause a problem or will the valve lash adjust out the difference?


I have a cam that the 2 lobes for one cylinder are the same but the other cylinders lobs are .025 higher than the other cylinders.

******This is not being measured from centerline of cam this is a total OD of the lobe. If it must be measured from centerline this measurement is not valid but the question still remains the same.

Would this cause a problem or does the valve lash/adjustment take up the difference?


Later

The measurement would have to be taken from the TRUE centerline to Verify if there actuslly is a height difference at the peak of the lobe or if its where the tappet rides when the valve is closed.

MAXX do you know the answer to the question?

I've noticed on a stock cam when you set your lash at 1/4 past TDC and then check the intake lash on the exhaust stroke and vice versa on the intake stroke, your lash can be off as much as .003. so if at TDC your set at .006 the lash on the actual valve operation could be as high as .009. WTF? My question is TDC the best way to set the lash. and why?

Sounds like an error on the grind to me. Like 50hp said Your intakes should match and your exhausts should match aswell. If you have 3 lobes that measure the same and one is .025 larger... you take that and make your own assumption. I would think they are all supposed to match.

Im not a pro by any means but i have an understanding of how an engine works and everything is based off of rotations. So your measurements wouls in a sense be take from the centerline of "whatever rotational" part you are measuring!

I agree they should be the same, the lash readings are at differnt points on the cam. so it must an error on the grind imo.

I'm not sayign its a error yet due to mine not beign a true measument. I will get back with you on that.

Update.

By 50HP calculation my lobes are within .007 so that a consistant grind in my book.


now back to the question if the lobes are not the saem would that cause a problem? The reason i'm askign is if a lobe of the cam goes flat where is all the pressure going duing the stroke/

Later

I think WHat 50hp said earlier if both intakes are the same and bothe Exhausts are the same it may be ground that way. Even with a difference in the 2 get what im trying to say? Hard to explain this.

Damn dude. You're like the rainman of mudmotors.

Id Say he has a great knowlege of engines. A picture is worth a thousand words good way to explain.

So am I to understand that Hoyts cam or the 493f is gonna be the best to pull from idle to 4500?


On install do you install it at 0* or advanced?

No advance. Align the timing marks.

But CAN it be done? We would always squeeze a little extra out of em by doing that on v8s

Anything can be done. You may not need to go a whole tooth though, and these cam's are not adjustable. I know Cody mentioned something about not doing it a while back. Something about the valve smacking the piston, maybe? I also remember a guy (?fowl habbit?) installed his cam wrong, want to say it was one tooth off and his motor ran like shit.

I had EVT put heads and a cam in mine and they advanced the timing.

right --- If I remember correctly we would advance the cam like .050 over stock



Or am I thinking about something else LOL

We're out of my league talking about cam timing. When I put in a cam, I align the marks and roll with it. I know the tractor and cart guys get adjustable cams. But then you can adjust them in minute amounts. They use a degree tool and set them exactly the way they want. I don't think you are gonna get the results you want by moving the cam forward in full tooth increments.

So on a 35 Briggs, can the valves open far enough to interfere with the piston if the timing is way off?

Gotcha --- I have done some hotrodding years ago -- but like I said its been years -- I remember some stuff but Im learning quickly that it dosent apply to these engines LOL


Hell I dont know if I wanna -- Im just thinking about doing it