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dakight
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PostPosted: Sun Aug 26, 2007 8:09 pm 
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That calc also gives his displacement as 327.7 cid......
Where'd ya get that?

I put the numbers in that calculator and came up with 9.43:1 with a 4.35 stroke and 9.24:1 with 4.25 stroke. I'm wondering if we're using the same numbers now.

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sandy in BC
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PostPosted: Sun Aug 26, 2007 8:15 pm 
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The same calc gives total dispplacement......I got 327.7 with Brens #s

..and a CR just like you got.


That means 54.5cid per cylinder instead of 43.

Lets find another calculator.....

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dakight
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PostPosted: Sun Aug 26, 2007 8:24 pm 
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Well, I know I'm old and fat and probably about half blind but I'm not seeing total displacement. I see a thing called total displacement volume but that's only 85cc, so, pardon my thickness but I still don't get it. It's also possible that my rickety old computer (I've got to get a new one soon!) is hanging up somewhere and I'm not seeing everything.

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sandy in BC
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PostPosted: Sun Aug 26, 2007 8:33 pm 
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I get 10: 1 here

http://www.kb-silvolite.com/calc.php?action=comp

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Charrlie_S
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PostPosted: Sun Aug 26, 2007 8:41 pm 
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Another entry. I get
9.24 with a 4.25 stroke

I did not use a online calc. I used the math.
area of bore is 10.128 cu in times the stroke =43.044ci or 705.488 cc
deck area =6.308 cc
gasket= 8.277 cc
combustion chamber= 68
valve relief=3
total volume is 705.488+6.308+8.277+68+3=791.073 cc
791.073 divided by (6.308+8.277+68+3)=9.24

PS 43.044 ci per cyl times 6= 258.264 displacement

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sandy in BC
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PostPosted: Sun Aug 26, 2007 8:59 pm 
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I get 10.2 .....007 deck.....64.5cc chambers....038 gasket valve relief 6 cc

I also get a 8.4 dynamic compression ratio which is high.....

That is a cam issue and prolly accounts for the high cranking pressures.

I used the cam card and this calc: http://www.kb-silvolite.com/calc.php?action=comp

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dakight
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PostPosted: Mon Aug 27, 2007 5:53 am 
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But he stated that his combustion chambers are 68 cc, not 64.5; that's what I've been using in the calculators.

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Charrlie_S
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PostPosted: Mon Aug 27, 2007 6:50 am 
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Quote:
I get 10.2 .....007 deck.....64.5cc chambers....038 gasket valve relief 6 cc

I also get a 8.4 dynamic compression ratio which is high.....

That is a cam issue and prolly accounts for the high cranking pressures.

I used the cam card and this calc: http://www.kb-silvolite.com/calc.php?action=comp
theses are the numbers I used
Quote:
Can someone run these new numbers just to be sure.
Bore = 3.591
Stroke = 4.25 or 4.35 this has yet to be varifed but it is no less or no more, and it only moves the CR .25 max
valve reliefs = +3 (after milling pistons)
deck height = .038 (after milling pistons)
head CC's = 68cc (after grinding/cutting 3.5cc more in)
gasket compressed = .048
gasket bore = 3.66


I am coming up with 9.24 / 9.43 (depending on stroke)

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Bren67Cuda904
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PostPosted: Tue Sep 04, 2007 5:59 pm 
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The stroke has been confirmed to be 4.25. The heads are 67.5 cc. The CR is set at 9.29. Cam shaft (240@50) has been install 2* advanced. (intake opens at 16* @50) I'll be picking up the motor tomorrow evening.
Some pic for your entertanment.
http://tinyurl.com/3578vo
http://tinyurl.com/2sr8cy
http://tinyurl.com/2rggyg
http://tinyurl.com/2qdxen
http://tinyurl.com/2tyz2q
http://tinyurl.com/2v8luz
http://tinyurl.com/3cs3ez

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Joshie225
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PostPosted: Tue Sep 04, 2007 6:16 pm 
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In the photo tags/captions you omitted the h in chamber.

I hope the engine runs well for you after all this.

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Bren67Cuda904
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PostPosted: Tue Sep 04, 2007 6:53 pm 
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Is there anyone that thinks a 3200 stall is to much for the 240@50 cam?

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slantzilla
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PostPosted: Tue Sep 04, 2007 6:58 pm 
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Quote:
Is there anyone that thinks a 3200 stall is to much for the 240@50 cam?
I wouldn't be scared, but I run over 3000 with a stock motor. :shock:

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Joshie225
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PostPosted: Tue Sep 04, 2007 8:45 pm 
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Is there anyone that thinks a 3200 stall is to much for the 240@50 cam?
<crickets chirping>
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Dart270
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PostPosted: Wed Sep 05, 2007 5:59 am 
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3200 is just about right for that cam/combo.

Lou

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AnotherSix
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PostPosted: Wed Sep 05, 2007 1:16 pm 
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Any reason why the short side radius looks untouched? I don't see any real relief around the valves either.

I would run that much stall with your cam, even in a v-8.
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