Quench distance

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Sep 7, 2003 | 09:26 PM

#16

GT40man

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Joined: Sep 2001

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From: Jax FL

Quench distance

take that to either kb or as engine shop

Sep 7, 2003 | 11:58 PM

#17

Brian S

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Quench distance

Yeah, the KB site has been down quite a while, but 99% sure from my notes.
UEM-KB148 STD, .020, .030, .040, .060 3.500 5.778 13cc Dish .912 $215.00
Keith Black #148 pistons - reverse dome, 1-relief, 13cc, 1.67 CH.

If you really want forged pistons you may have to go a different way.

10.3
-2
-6.58
-1.67
-------------
.050 DC
-*** offset?
-*** decking?
------------------
*** ?
I'm not sure why you want to use the 400 pin.
You may have a hard time finding a machinist willing to offset bore the piston.
At least that was mentioned in a previous post.
Which aluminum heads again?

I can probably do a set of rods for you. Ask me about the details on my forum.
http://autos.groups.yahoo.com/group/...1Boss351HO400/ or
www.yahoogroups.com Keyword "351C"

Last edited by Brian S; Sep 8, 2003 at 12:19 AM.

Sep 8, 2003 | 06:28 AM

#18

danlee

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From: Delaware

Quench distance

The heads are Austrailian 3V Aluminum heads. The web site is

www.chiheads.com

Sep 8, 2003 | 09:33 AM

#19

Brian S

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Quench distance

Yes, I'm familiar. Those are some kick-*** heads but a little pricey for an average rebuild. I posted a bunch of picks on my forum. There are a couple other heads to consider, I'll talk with you on my Yahoo forum.

Sep 8, 2003 | 08:15 PM

#20

danlee

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From: Delaware

Quench distance

I found a program to calculate Dynamic Compression. If I put in 64cc heads, 0.040 gasket, 0.0 deck height, flattop piston and use my intake valve closing at 72 degrees ADBC, I get a effective stroke length of 2.899" and dynamic compression = 9.2:1.

9.2 x 14.7 = 135.24 lbs of cylinder pressure

I think the quench should be quite effective with this dynamic CR.

Sep 8, 2003 | 09:14 PM

#21

Brian S

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Quench distance

Was that online somewhere or can you break down the numbers you have to use?

Sep 9, 2003 | 06:02 AM

#22

danlee

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From: Delaware

Quench distance

I downloaded a program for Dynamic Compression that I got from this website.

http://cochise.uia.net/pkelley2/DynamicCR.html

I ran it using a 4" stroke, a 64cc head and flattop piston, Zero deck height and an intake valve closing of 72 degrees ABDC. It gave me an effective stroke of 2.899". I ran that through my CR calculator and came up with 9.2:1 as the Dynamic Compresion ratio(DCR). The Static Compression Ratio(SCR) for these specs is 12.5:1.

Reading the explantion at the website, I find that 8.5:1 is maximum DCR for a street motor on 92 Octane.

All this is telling me that I must reduce my SCR in order to reduce the DCR to 8.5:1, or get a longer duration cam.

Now I can dish the piston or change cams to get that reduction.