Sidewinder intake VS modern, Edel, Pond, BT ?

[FUNFER2]

These is my thoughts on manifolds, for cobras.

Dual plane for owners that want nothing too radical of a engine, good even power through out the lower & middle rpm range. And, to be able to fit under the hood.

Single plane owners that have pretty stout big motors like mine, that already have high low rpm power, and is going to run higher rpm's and a lot of HP up top. Since I don't plan on making my cobra & motor a race car, road race or drag, I personally, think a overabundance of low rpm TQ, is just plane fun. I'm not so concerned with traction.

If I did race and was concerned about traction, I would build my cobra completely different.

IFS/IRS racing suspension, small block engine, light wheels, track tires, Richmond tranny, ect......

My cobra is for fun on the street, a bit of traveling, and occasional track time.
All out brute force, over the top performance and amazing sounds & feel.

(do you have the cam specs and dyno information on that Shelby FE) ?

Anthony- What are your cam specs & how do you like the solid on the street ?

[gsharapa]

CSX3170 didn't post the specs but he is on the forum so you could send him an email. It's a big motor with high compression so a bit of a different animal then what we are building. I talked to Keith and he said he has done a few Victors and milled the carb flange .500 to make sure everything clears. Said it would definately kill some of the low end tork and build more power up high and that's what I really want so I'm going that route now....

[FUNFER2]

I agree, and think we'll never miss the little torque loss in our cobras.
So, we see eye to eye.

[Anthony]

Originally Posted by FUNFER2

Anthony- What are your cam specs & how do you like the solid on the street ?

about .680 lift, duration about 255-260 @ 0.050

Solids make more power than a similar spec hydraulic roller, from what I have seen, above 5000 rpm's.

There are drawbacks.

1. with an all aluminum engine, at ambient temperature about 70 F, the valve lash needs to be about 0.015 tighter to get the desired lash at operating temp. I have found it very difficult to start when the temp is below 50 F, sometimes impossible, as the lash is then too tight. Cast iron block is friendlier in cold weather.

2. With the stiffer springs, things can break easier, ie rocker arms.

3. Sometimes there is severe galling at the pushrod-rocker cup, but, from the various solid roller lifters I have seen, the ones with oiling to the roller bearings (crane, crower, jesel), the lifters also have an oil feed hole in their pusrod cup, and will likely oil feed the top of the pushrod if running hollow pushrods, and may eliminate that issue.

I'm still on the fence whether I should have gone hydraulic roller or not. My friend has a KC 482" FE hydraulic roller, dyno'd by KC with 600 HP at the flywheel. My engine is stronger by seat of the pants guaging. At another chasis dyno, not the one where I had my car done, his car dyno'd at about 400 rwhp and 400 rwtq. He runs an edelbrock performer rpm, and holley 950 or something like that.

[FUNFER2]

I now have a big,... problem with getting the motor done in time for the magazine shoot & interview's, at the Run & Gun, courteous of the salesman with Mahle Pistons. I ordered the slugs in first week in July and assumed,..... they were delivered to the engine builder, but when told me yesterday, he has not received them, I called Mahle, and my sales guy said he was sorry, that he did not put the order in !

Now it will take 3 weeks for them to custom make the 4.375 bore = 4.380 piston size. I did call two other company's, and they also would take about the same time to make.

As of today, if Mahle starts making them, by the time Dennis receives them and builds the motor, then delivered to me and time for me to install, I don't think I'll make the show.

Today- August 25
Pistons made in three weeks- Sept- 14
I would like 7 days to install & road test- Sept. 17
Run & Gun- Sept. 23-25

I don't see how I'll make it. Any ideas other than reducing the cid to 482 or 496, for shelf pistons ? Although, I would hate,.... to do this !

This screws up the entire project. I'm over being mad and now it really saddens me very much.

[Barry_R]

What is the desired compression distance? Pin size? Ring pack? I have something for another project on the shelf...

[blykins]

You could use a Ford 460 stroker piston if you're really in a bind.

Use a standard 4.360" bore, or a .030" over 4.390" bore.

FE deck height = 10.170 - 6.700 rod - 2.125 (1/2 stroke) = ~1.345" C/H

If you used a 557 piston with a ~1.350" C/H, it would share the same wrist pin as the BBC rod used in the FE strokers.