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| The Turbo Super Duty Build. (Page 38/63) |
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thebaron
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JUL 26, 10:09 AM
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| quote | Originally posted by Mr.PBody:
Oh, so the SD4 is a pushrod I-4? Sorry SUHC sounds funny to me...
Did you ever get ahold of cams? This project is so sweet I want a DOHC SD4 now forget V6s. What kind of power do you think you'll get 500? WIth 370 n/a cars 500 seem plausible. What tranny are you going to run? |
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What the heck is SUHC? Wonder what type of power that V8 with the SD4 heads put out?
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Fastback 86
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JUL 26, 12:46 PM
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Single Under Head Cam, a.k.a. Pushrod.
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FastIndyFiero
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JUL 26, 01:00 PM
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| quote | Originally posted by crytical point:
Maybe cams for a cosworth vega would work because the DOHC head is just like it and I know crane cams has a couple grinds and cams they offer for the cosworth head. its woth checking out because I am doing something similar with a 2.0 DOHC vega block and any little help is worth it. |
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That's what I thought at first too...Unfortunately it's a no-go. Here's a pic of the Vega topside:
And a pic of my topside:
On the SD head, the cam bearing bosses are located in between the valve tappet bores. This is a good thing because it minimizes cam flex by reducing the distance from the load on the cam to the support. On the Vega head, however, the cam bearings are located to either side of a set of valves for a single cylinder. In addition, the Vega motor, as well as other 4cyl Cosworth engines, use belt-driven camshafts, whereas the SD head uses a chain drive.
So the camshafts that I need are actually extremely similar to the Cosworth XB, XD, and XF series of Champ Car engines:
Same bearing arrangement, also chain driven camshafts, it even has the same valve/port angle. but I doubt the bore and valve spacing is the same.
And if you thought your pushrod Duke cam gear was noisy...
Imagine that at 13,000 RPM.
| quote | Originally posted by thebaron:
What the heck is SUHC? Wonder what type of power that V8 with the SD4 heads put out? |
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Single Under Head Cam. The 2.65 litre Cosworth XF V8 with similar heads put out 800HP on methanol and boost. Add another 3 litres of displacement....
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crytical point
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JUL 27, 04:20 AM
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bummer ... but worth a try mentioning. Is the SD4 head 2 piece or solid because mine is 2 piece on the vega. I am really impressed by cosworth's design and over all performance combined with reliability. Currently the cosworth club is working with Fidanza to get some adjustable sprokets but when that is done I could spin the engine to 11,000 and make a potent race car but I am going turbo but I will not hit your hp numbers or anywhere near them. I should be sitting at 420-450 hp at 8500 and 37psi but to be safe I will sit at just 400hp and 32psi but my engine will weight in at 260lbs wet with all accessories which willbring my car to a little under 1700lbs and a near perfect 50/50 distribution roblem is keeping in staight at top rpm.
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thebaron
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JUL 30, 09:47 PM
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How are you planning to cool this monster of a 4 banger? Intercooler for the turbo? How about bringing her to a halt? What is planned for the rest of car?
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30+mpg
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JUL 30, 10:09 PM
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A couple of good heads (along with some other goodies bolted on).  [This message has been edited by 30+mpg (edited 07-30-2007).]
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FastIndyFiero
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JUL 31, 01:17 PM
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| quote | Originally posted by thebaron:
How are you planning to cool this monster of a 4 banger? Intercooler for the turbo? How about bringing her to a halt? What is planned for the rest of car? |
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Planning on using some kind of aftermarket radiator. The IC is an air/water Spearco, I think it's on page 5, I'll run that with a full width heat exchanger up front. The stopping is yet to be determined, I have stock rears and the GA upgrade fronts. Right now I'm thinking 13" Wilwood GT rotors and hats with Red Devil 300 Series calipers that I already have for a different project that they were too heavy for.
I begin on suspension and interior improvements after the engine is finished and the car sees the track at least once.
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Mr.PBody
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AUG 04, 11:17 PM
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Looking sweet. Any good news on cams?
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FastIndyFiero
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AUG 06, 04:16 PM
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No news, I e-mailed a couple of places that haven't responded yet. Apparently I need to try the telephone.
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FastIndyFiero
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AUG 20, 02:12 PM
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Something along the lines of what I might build for the DOHC intake.
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