Cadco pro street heads and cam choice I FIND THE PROBLEM!

Caddy123

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Hello anybody overhere use ported polished pro street cadco heads .
Im looking for a cam that the best is with this heads.
And.anybody flow nr of this heads.

Gr Danny
 

Caddy123

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Re: Cadco pro street heads and cam choice

I think my heads are to big for my 10.1 cr 450 hp aplication.
And max 5000rpm
 

8ad-f85

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Re: Cadco pro street heads and cam choice

The engine's components greatly exceed your goals.
You could simply use a much bigger cam and the engine would respond favorably in every way.
You don't have to run it as hard, if you don't want to.
 

The Mad Cadder

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Re: Cadco pro street heads and cam choice

You wont see 450 hp with a mt10 :no:
At 10 to 1 on 92 or 93 it will be excellant for detonation though
Causing it that is .. if you must have a MTS camshaft a15 would be a
better choice but not a good one because of the wide LSA and lack of
overlap and to a lesser degree lift..

And you would probably get 450 hp with one

You have middle road heads.. even if they were Pro Comp they wouldnt be
too big.. Cad heads are small for the engine displacement..

You have Forged I beams ..whats with the 5000 limit.. :boggled:
And if you dont get your bearings set right it wont matter anyway
 

Caddy123

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Re: Cadco pro street heads and cam choice

Ma cadder its a cruiser traffic light racer not for strip use.
Al make it 7000 rpm not a problem haha.
But 90 % im driving around 60 mph.
So if tHere is a cam that suits.
And why a mt 10 cam detonate
on 10.1 cr. on pump gas 92.
iHad a 70 eldorado 10.1 stock and drives fine on 92.
The 15 mts I like that also.
Thanks for help
 

8ad-f85

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Re: Cadco pro street heads and cam choice

Because it will likely create too much cylinder pressure at a low rpm.
The stock cam starves the engine of air, even if the duration #'s might be similar.
A slightly bigger cam yet will move the cylinder pressure curve to a slightly higher rpm, away from detonation tendencies.
Again...you don't HAVE to run it hard, it will still be plenty tame.
Ignore most any Cam selling company's suggested rpm ranges for Cadillac.
They are fairly meaningless.
Rpm ranges have way more to do with the heads anyways, the cam is intended to match what they guess you might be doing with the heads and/or it's merely a suggestion for marketing purposes.
 

Caddy123

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Re: Cadco pro street heads and cam choice

This cam is advice me for my porpose.
But only detonation!!!
Ps my cranking cr is around 210 to 230 psi.
Rings are not set yet.
Gr Danny

SS 205 T-D High compression (10:1 or more) ‘ported head’ RV cam.
Restoration, Towing, Mild Hot Rods, Cruisers. Good Idle, Best choice for low RPM engines with ported heads
 

Ted in Olympia

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Re: Cadco pro street heads and cam choice

That is very high cranking pressure for pump gas. Do you have a picture of the top of your pistons? Do they have a large valve relief, should be around 28cc? Almost sounds like to me you have flat top pistons and early heads to get cranking compression with those numbers. Should crank around 180 or so max for pump gas.

What is the quality of your gas over there?

Ted
 

Caddy123

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Re: Cadco pro street heads and cam choice

I had first Kb pistons But the are sh rinks after break in.
These are 2032 racetec pistons.
Special made for my bore.
 

8ad-f85

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Re: Cadco pro street heads and cam choice

You mean 4032 racetec's?
A 20xx piston would need a very different clearance.
There's no quench with that piston, which makes it even more difficult to run pump gas.
Your cranking compression is way too high for pump fuel.
Ignore the cam descriptions and follow the vast advice people are giving you...read through the forum for your answers :D
Cam it much bigger and watch the detonation problem nearly disappear..
 

Caddy123

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Re: Cadco pro street heads and cam choice

Yes I mean 4032.
Block is zero deck only quench I have is the head gasket.
.050
Gr Danny
 

8ad-f85

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Re: Cadco pro street heads and cam choice

With a dish like that, there is nearly no quench.
The ring around the edge of the piston IS the quench area.

http://www.wallaceracing.com/dynamic-cr.php

Put the 'intake closing' point, along with your engine specs into this formula.
Make your goal 150-170psi (using bigger cam specs) to BEGIN planning your next build.

Still need to figure out oiling issues and determine other clearances before the necessary machine work.
 

Ted in Olympia

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Re: Cadco pro street heads and cam choice

I'm not an expert but it does not look like a good piston design to prevent detonation and does not create any quench. Kind of reminds me of the 1980's type pistons that would ping at 8 to one compression.

The picture is the forged piston that MTS sells (or at least when I purchased them). The flat are matches the head and help prevents detonation.

I would say that your engine is about 10 to 1 compression.

Ted
 

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8ad-f85

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Re: Cadco pro street heads and cam choice

The flat IS the quench :D
That piston is a pretty good design with the exception of any sharp edges that might be left, like from the valve notches.
It would be strongly encouraged to radius those if concerned with ping.
This is a case in which a SLIGHTLY higher compression resulting from the increased quench area would likely do a better job with pump fuel.
 

Ted in Olympia

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Re: Cadco pro street heads and cam choice

8ad-f85 said:
The flat IS the quench :D
That piston is a pretty good design with the exception of any sharp edges that might be left, like from the valve notches.
It would be strongly encouraged to radius those if concerned with ping.
This is a case in which a SLIGHTLY higher compression resulting from the increased quench area would likely do a better job with pump fuel.

Are you talking about the original posters pistons or my pistons from MTS?
 

8ad-f85

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Re: Cadco pro street heads and cam choice

Your pistons have actual quench.
I'm being overly obvious due to the language issues.
 

Ted in Olympia

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Re: Cadco pro street heads and cam choice

I looked around and tried to find some cams to compare. Base on the web-site provided I came up with:

I found a post with a 200T and the valves closed at 46 so this is 185.88, don't know if this is the same as the original poster's cam? The Poster said his was 210-230?
I think the stock cam is 35 so this would make it 197.08 (when I had a stock engine with flat tops I was coming up with about 205)
On the potter's 500hp cam, no longer available, 48 so this is 183.49
The new T-bird cam is 52 so this would be 178.73

So to get down to the 150-170 range you would need a very large cam, maybe closing in the 60 range (I would not want to go there on a street car).

Must be something else wrong here for a 210-230 cranking pressure.

8ad-f85 said:
With a dish like that, there is nearly no quench.
The ring around the edge of the piston IS the quench area.

http://www.wallaceracing.com/dynamic-cr.php

Put the 'intake closing' point, along with your engine specs into this formula.
Make your goal 150-170psi (using bigger cam specs) to BEGIN planning your next build.

Still need to figure out oiling issues and determine other clearances before the necessary machine work.
 

8ad-f85

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Re: Cadco pro street heads and cam choice

A really sharp tuner and builder might easily live with near 200 psi, with the understanding that the number might change based on crank speed or many other variables.
I doubt the OP would pick a cam ending up near 150-160 psi, so I was pushing that a bit far in that direction hoping to settle for some middle ground.
I won't even begin to guess why the PSI is higher than expected...
This project really needs some planning as if it's a fresh build, with every part of it scrutinized.
Some of the "how to" and "high performance builds" books of any brand would be a good starting point.
 

Caddy123

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Re: Cadco pro street heads and cam choice

This is the cam card.
But have a really the wrong pistons.
My inglish is bad so I do not understand every ting. ..

 
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