496 ci Cammer Street Engine Dyno Results

[blykins]

He's pulling V/E and A/F off of one carb.....

[vector1]

wonder how it would score on the emc contest.

[Keithc8]

Like Brent said we are checking just one carburetor so it is half the air fuel ratio. Just double what you see. We are using an air turbine and flow meters to each carburetor. We would need a box around both carburetors and measure the air going through both. It is a little confusing but only see it on 2X4 stuff. If you double the numbers you get about 13.5 to14 to 1 air fuel ratio.

Thanks, Keith

[elmariachi]

Originally Posted by Excaliber

Well the numbers are funny, except for the horse power numbers, they rock!!! I just don't know how we got there.

We got there with $40k. Just put it on your black AMEX Ernie, you sure as hell can't take it with you.

[Keithc8]

We had to borrow some valve covers to run the engine from Jay Brown as well as a set of his headers.
I am waiting on covers from three different sources, I am sure that they will all be done about the same time.
The engine was not run with that air cleaner, it had no air cleaner at all. If I was going to use that air cleaner I would get a K&N element to go in it. I am sure that the air cleaner would hurt it a little. The engine gave us no problems on the dyno and really surprised me on how well it idled and how smooth it ran. This thing will idle at 700 rpms and would cruse at 2500 rpms I think. Not very noisy or anything like I thought it might be. Ended up being a pretty neat peice.
Is someone would buy my Kirkham that I have for sale right now I would do one with this thing.

Thanks, Keith

[twin turbo]

Did you run sidepipes on that dyno run or was that with open headers? Impressive numbers. Cheers.

[Keithc8]

Being that I do not even have headers for a 427 Cammer as I am sure most do not either, I borrowed a set from Jay Brown that he uses on his dyno. It was dynoed with open headers into our 5 inch exhaust pipes through our large mufflers.
Like most engines you would lose about 20 to 25 percent at the rerar tires depending on the headers, side pipes, mufflers and rear end in your car. This means that you could only have about 600 to 620 at the rear tires on a street car.
On a full race car that is worked out well you will get most all of it to the rear tires.

Thanks, Keith

[olddog]

I noticed the dyno sheet said 30 deg timing. It is my theory that the shorter the distance from the spark plug to the far edge of the cylinder the less timing an engine needs. So does the Hemi design make its best power at significantly less timing or did you have to retard it due to the compression and pinging?

[twin turbo]

Keith, 600-620 at the rear tires is a sweet number. Thats right about what I run, but I cheat and do it with turbos, lol. Traction can definitely be a problem on the street at times. Cheers.

[Keithc8]

That is where he started with the timing and did not change it in the computer when we went to playing with the timing. It liked about 36 to 37 total and we ran it on premium pump gas and 110 fuel on that timing and the race fuel only made about 1 or 2 HP difference. I thought it might take less timing but I guess with the dome it takes a little while for it to get over it.

Thanks, Keith

[olddog]

Originally Posted by Keithc8

That is where he started with the timing and did not change it in the computer when we went to playing with the timing. It liked about 36 to 37 total and we ran it on premium pump gas and 110 fuel on that timing and the race fuel only made about 1 or 2 HP difference. I thought it might take less timing but I guess with the dome it takes a little while for it to get over it.

Thanks, Keith

Certainly a longer path across the bore, when you have to travel over the dome. If the plug is in the center it cuts the path in half, but I see from the pictures the plug is off center. Hard to tell. I guess one would actually have to measure the hemi head verses a standard head to know what the actual distances is.

You also thought it may take less timing. In your experiance, does the distance from the plug to the far wall (length of flame travel) corrolate to shorter distance equal less timing needed.

Thanks for humoring my curiousity.

[Keithc8]

The problem with this head and the old hemi head is not so much the location of the plug which is real close to the center but the size of the cmaber and how far away the plug is away from zero deck.
The smaller chambers with the plug located close to the center run the least amount of timing. Like the Yates heads, Cheverolet 18 degree heads with the small chambers. These heads are in the 35 to 40 cc range and you run a flat top or a reverse dome pistons.

Thanks, Keith

[olddog]

Dang - I had to slobber on those pictures again.

If only I could of had the smarts to make the big money or lower moral standards, so I could have stole it.

[RodKnock]

Just thought I'd post KC's eBay auction of this beauty:

http://cgi.ebay.com/ebaymotors/Ford-...item5888ba2eb0

Don't sell it now. Hold on to it for a few years.