Another cam question
Stellar HDF Member
Joined: Aug 2007
Posts: 2,052
Likes: 342
From: Virginia Beach
From the cam profile, the 510 should be a decent cam. I have a 508 in a box that goes in my evo this month. You can get decent prices by shopping around. My friend had a leinweber cam in his evo years ago. Hot cam. Ramps are really aggressive. Make sure the valve train is in top shape. Too much cam is worse than too little. Clay those valves.
Thread Starter
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Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Any other engine mods?
Club Member
Joined: Aug 2008
Posts: 22,857
Likes: 17,908
From: Lafayette, Louisiana
THC,
Is your engine 80" or is it bigger? How much cranking pressure does it currently have?
How many rpm and how much mph is it running out of steam?
Is your engine 80" or is it bigger? How much cranking pressure does it currently have?
How many rpm and how much mph is it running out of steam?
Last edited by Prot; Mar 16, 2017 at 03:10 AM.
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Thread Starter
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Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Currently not enough cranking pressure but things are underway to solve that.
It's the roll on at hwy speed that I don't think is strong enough.
Club Member
Joined: Aug 2008
Posts: 22,857
Likes: 17,908
From: Lafayette, Louisiana
The EV27 reduces your cranking pressure. Since Evo's are marginal psi when stock, any reduction is going to be detrimental.
One of these days I need to check to see what I am running at.
I took .025 off my heads, went with .030 cometic gaskets, and an EV13 cam. The EV13 is good with stock compression but I wanted a little more and it paid off.
Since you have an EV27, you could take more off the head if there is enough clearance or simply run higher compression pistons. You need to be at least 180psi if you are interested in performance. Also check the variance between the cylinders.
I think that combined with a little tweaking of your carburetor afterwards would be the first place I would start, then if that doesn't do it, then change the cam.
The higher compression will broaden the torque curve and increase the responsiveness and it sounds like that is what you need.
I have to run 91 octane or higher. I was in a remote area one time and the only gas available was 87. I found I had to keep it in one gear lower than normal for the speed I was going to prevent pinging until I could get some higher octane gas.
I remember back in the day, Jerry Branch of Branch Flowmetrics was the super guru of heads.
One of these days I need to check to see what I am running at.
I took .025 off my heads, went with .030 cometic gaskets, and an EV13 cam. The EV13 is good with stock compression but I wanted a little more and it paid off.
Since you have an EV27, you could take more off the head if there is enough clearance or simply run higher compression pistons. You need to be at least 180psi if you are interested in performance. Also check the variance between the cylinders.
I think that combined with a little tweaking of your carburetor afterwards would be the first place I would start, then if that doesn't do it, then change the cam.
The higher compression will broaden the torque curve and increase the responsiveness and it sounds like that is what you need.
I have to run 91 octane or higher. I was in a remote area one time and the only gas available was 87. I found I had to keep it in one gear lower than normal for the speed I was going to prevent pinging until I could get some higher octane gas.
I remember back in the day, Jerry Branch of Branch Flowmetrics was the super guru of heads.