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roadrage david · 02-26-2005, 11:51 AM

400 stroker to 461(4.25 stroke)

Jagtec1 · 02-26-2005, 12:31 PM

I'm building a "400" also!

Says so right on the block!

pro-tour79 · 02-26-2005, 12:37 PM

have not looked at an after market crank in a while but that crank has no hash markes for the rear seal don't look like a 400 crank to me

GTO71 · 03-01-2005, 04:20 PM

No, I am having 9.5 comp with the custon pistons, also if you look on how most piston companys rate compression ratios with heads they are usually rated with the pistons .008 in the whole and the TRW pistons have for valve releafs, using a head gasket of about 45 thousands. My gaskett is 37 thousands compressed and like I said I have custom piston made up to get the compression of 9.5 to 1 and I said that my slugsd were .005 in the hole but they relly close to being a 0 Deck height.

Jagtec1 · 03-01-2005, 06:55 PM

Are they domed pistons??? Don't look like it. My calculations with .037 compressed gasket, zero deck, and let's say 5cc valve relief area still only come to around 8.3:1 with a 3.75 stroke and 4.181 bore (If that is what the bore and stroke are). I'm not trying to be a jacka$$, just curious as to how you are arriving at those compression #'s with a 102cc head.

loren · 03-01-2005, 07:50 PM

nice

GTO71 · 03-02-2005, 08:45 AM

No man, They are custom made pistons, I gave the piston manufactor the spec of my rod lenght, deck height, cc of chamber and head gasket thickness and got a piston designed to get a 9.5 to 1 ratio. Jeez I put pics up for peolpe to enjoy and get my head bit off. I got too much time invested and money not to waste by goofing up on a compression issue!!!!!

GTO71 · 03-02-2005, 08:45 AM

And I will let my time slips to the talking.

Lerry: The Body Ventura.. · 03-02-2005, 09:08 AM

Time slips won't be talking that loud with that c.r. Unless with some kind of boost.

russ467 · 03-02-2005, 09:11 AM

rolling money pits · 03-02-2005, 09:17 AM

gto71, what machine shop were/are you using?

Jagtec1 · 03-02-2005, 03:48 PM

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by GTO71:
No man, They are custom made pistons, I gave the piston manufactor the spec of my rod lenght, deck height, cc of chamber and head gasket thickness and got a piston designed to get a 9.5 to 1 ratio. Jeez I put pics up for peolpe to enjoy and get my head bit off. I got too much time invested and money not to waste by goofing up on a compression issue!!!!! </div></BLOCKQUOTE>

Dude, relax! Nobody's biting any heads off. I was curious as to how you arrived at those numbers! I asked a few questions...SFW. You posted your combo, and some pics, and you don't want to answer any questions about it??! I still am not sure how you are getting the numbers you are claiming. But, I guess either it's "Top Secret", or you're not really sure. Either way...I'd be interested in your time slips. If you don't want to share your info, then why post the combo and pics in the first place? What did they do to your custom pistons that will allow you to achieve 9.5:1 CR in a .060 over 400 with 102cc chambers...if they are not domed?? Seriously, I'm curious! I agree that you'll need a bit more compression based on MY calculations to pull off some serious time slips with that 400. Good luck with it! (Not being sarcastic)