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393 Cleveland Stroker Help-- 

 

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 Post subject: 393 Cleveland Stroker Help--
Posted: Fri Mar 30, 2012 11:40 am 
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Hiya, looking to get some advice on a 393c stroker, I need to know if anyone can tell me if I can successfully machine the chambers in my 2v closed chamber heads to get about 80cc, I need to lower the compression ratio a bit to be able to run it on pump gas, I am aware I will need to run a fairly radical cam to get what I want, It is currently at 10.5:1, I want to achieve as close to 10 as possible. If I machine the chambers will this upset my quench? and if so can I get rid of the resulting knock with a better timing curve? I currently have a zero deck height..

Regards Andy
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 Post subject: Re: 393 Cleveland Stroker Help--
Posted: Fri Mar 30, 2012 3:19 pm 
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2V open chambers were 72-78cc so that gives you an idea.....

10.5:1 on closed 2V's is fine with even a moderate cam around 224 @ 050 running on ultimate fuel. This requires no compromise on spark advance curve. If your piston is dished rather than d-cup design, you may need to pull back on compression a tad

 

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 Post subject: Re: 393 Cleveland Stroker Help--
Posted: Fri Mar 30, 2012 4:29 pm 
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xafalcon wrote:
2V open chambers were 72-78cc so that gives you an idea.....

10.5:1 on closed 2V's is fine with even a moderate cam around 224 @ 050 running on ultimate fuel. This requires no compromise on spark advance curve. If your piston is dished rather than d-cup design, you may need to pull back on compression a tad


It has flat tops with no valve relief etc, will it still be fine to use the 2v open heads? someone has suggested a cam with 235ish @50deg, what are your thoughts?

Cheers Andy
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 Post subject: Re: 393 Cleveland Stroker Help--
Posted: Fri Mar 30, 2012 5:31 pm 
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no valve releif - make sure you check piston to valve clearance!
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 Post subject: Re: 393 Cleveland Stroker Help--
Posted: Fri Mar 30, 2012 5:37 pm 
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66 coupe wrote:
no valve releif - make sure you check piston to valve clearance!



Miles of room in that respect, just a bit concerned that when I crunch the numbers if I run with the 2v closed chamber heads, it works out at about 12.5:1, not exactly street friendly. But if I run with open heads at 77-78cc still around 10.5, I really want about 10:1 for some safety, I just want to know if anyone has machined a few cc's out of closed heads and what results they got.
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 Post subject: Re: 393 Cleveland Stroker Help--
Posted: Fri Mar 30, 2012 6:10 pm 
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You said it was currently 10.5:1 with closed 2V's......

Open chamber cleveland heads will ping anywhere from 9.5:1 upwards, and really aren't a good combustion chamber design except for emissions. I don't use them, ever

I would use a D-cup piston & closed chamber 2V heads opened up to about 66cc's to unshroud the valves.

 

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 Post subject: Re: 393 Cleveland Stroker Help--
Posted: Fri Mar 30, 2012 6:16 pm 
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Does it ping due to the lack of quench with the open heads?
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 Post subject: Re: 393 Cleveland Stroker Help--
Posted: Sat Mar 31, 2012 11:39 am 
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Do you specifically want to stay with Iron heads Andycap?
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 Post subject: Re: 393 Cleveland Stroker Help--
Posted: Sat Mar 31, 2012 2:40 pm 
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Yeah I would like too if I can make it work.
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 Post subject: Re: 393 Cleveland Stroker Help--
Posted: Sat Mar 31, 2012 6:07 pm 
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Anything else you already have that you want to keep?
Personally I'd run a dished piston if I was to stay with CC iron heads but then, I wouldn't stay with iron heads.
If you already have a flat top stroker kit and don't want to change that I'd use OC heads but then I'd just buy CHI alloy heads.
It sounds like you already have a built set of CC's that you just want to open up a bit? I've only heard of small amounts of 5-6cc being removed but that's not to say more couldn't be?
Are you able to machine a chamber shape dish into the pistons? This would be more desirable. Of course they need to be able to take it.
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 Post subject: Re: 393 Cleveland Stroker Help--
Posted: Sat Mar 31, 2012 7:43 pm 
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Yeah you are right, I already have a set of closed 2v heads that are already built, I have access to an NC machine and a top operator for nix, I might have to talk to him and see if he look at maybe splitting the difference over the heads and pistons.
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 Post subject: Re: 393 Cleveland Stroker Help--
Posted: Sat Mar 31, 2012 8:38 pm 
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Yeah you are right, I already have a set of closed 2v heads that are already built, I have access to an NC machine and a top operator for nix, I might have to talk to him and see if he look at maybe splitting the difference over the heads and pistons.
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 Post subject: Re: 393 Cleveland Stroker Help--
Posted: Sun Apr 01, 2012 7:06 am 
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A dish-top piston design is old-school. When you dish the piston top you loose quench, and effective quench is especially important when you're getting close to a detonation limit. The D-cup design is the way to go as it leaves the quench area untouched and fully effective.

 

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 Post subject: Re: 393 Cleveland Stroker Help--
Posted: Sun Apr 01, 2012 12:51 pm 
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That'd be the way to go I think Andycap, You could do your chamber first and mirror that shape into the piston.
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