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11-13-2009, 12:05 PM | #1 |
Champagne Taste on Beer Budget
Join Date: Dec 2008
Location: High Ridge, Missouri
Posts: 2,190
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Dish Pistons + 64cc head = ??
Okay I am gathering parts for my Small Block Chevy 406 Build.
And came across a nice set of 4.155 (.30 over) pistion that are dished. My question is what would the compression ratio be with 64cc heads? If too low I might need to sell them for flat tops. Thanks for any help you could offer.
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11-13-2009, 01:25 PM | #2 |
On a budget like Fred Sanford
Join Date: Oct 2005
Location: Topeka, KS
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Re: Dish Pistons + 64cc head = ??
Depends how big the dish is.......
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'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD |
11-13-2009, 11:33 PM | #3 |
60-66 Nut
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Location: Coeur d'Alene, Idaho
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Re: Dish Pistons + 64cc head = ??
Yep, Need to know how many CC's in the dish.
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11-14-2009, 11:56 AM | #4 |
Registered Truck Offender
Join Date: May 2008
Location: hells training ground (aka Ariz)
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Re: Dish Pistons + 64cc head = ??
I don't think your going to need to worry about too LOW.
If those pistons are a 22cc dish, and you have a stock 0.025" deck, the 64cc heads will net 9.3:1 Deck the block to 9.000 and you have 9.8:1 If those are a 11cc "D" dish as is typical in most aftermarket 400 pistons, you start at 10.3:1,, deck the block and it's up to 11:1, cut 0.020" off the heads to 'clean them up' and your up to 11.3,,, it get's out of hand REAL quick with the big bore. Here's an example. The sbc in my Nova I run a 12cc dish custom JE piston. Had to to get compression DOWN to 13.2:1 (4" stroke, 4.165" bore, zero decked, 53cc chamber) Don't depend on any 'advertised' or assumption. Get EVERY component measured so you know EXACTLY what your dealing with
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Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral. |
11-14-2009, 04:34 PM | #5 | |
Champagne Taste on Beer Budget
Join Date: Dec 2008
Location: High Ridge, Missouri
Posts: 2,190
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Re: Dish Pistons + 64cc head = ??
Quote:
From what I have been reading, I would need a camshaft that has higher than stock compression ratio to make the cam and timing work correctly. Will be tearing down the engine this weekend and hoping it has not been rebuilt so the bore can be machined to .30 (4.155 for the pistons I have). Great info so far guys! Keep em coming.
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11-15-2009, 01:26 PM | #6 |
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Join Date: May 2008
Location: hells training ground (aka Ariz)
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Re: Dish Pistons + 64cc head = ??
Turkey baster will give you a 'very rough' Idea,, get some clear plexiglas, a jar of vasaline, and a cc dropper from any friend that has kids. Childrens medicines have a cc dropper that is quite accurate.
Drill a 3/8" hole in the plexiglass, seal it to the chamber / piston or whatever with a generous smear of vasaline, tip the item slightly and position the 3/8" hole the at the uphill most area,, fill and count, fill and count. You can get a VERY acurate volume that way. You can have your machinist measure compression height and deck height to get the deck clearance, OR,, move the piston exactly 1" down the bore (using a dial indicator) and use your plexiglass to measure the volume the bore holds. subtract the volume of the bore x 1" and you have piston to deck volume, valve reliev volume, CH, everything all in one measurement. Piston to deck volume plus gasket bore volume plus head chamber volume... all of that PLUS swept volume (bore and stroke volume ,, pi x R ^2 x stroke), you have everything you need to calculate EXACT compression ratio. Cam suggestion is a lot more than compression. But without compression you don't have a starting point. One you know your compression (or just post the measurements and plenty of people here that can calc it all for you) and tell us all the details,, trans, convertor, rear tire, use (race, street, towing ????) THEN you can get a rational cam suggestion. Untill then,, it's just a shot in the dark and a guess.
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Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral. |
11-16-2009, 04:57 PM | #7 |
Registered User
Join Date: Jun 2008
Location: Frostburg, Maryland
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Re: Dish Pistons + 64cc head = ??
You can buy a decent syinge cheap from any farm store [used for animals]. Good enough for the hobby guy imo. I paid $5 for a 60cc version.
Dave
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11-16-2009, 10:29 PM | #8 | |
Champagne Taste on Beer Budget
Join Date: Dec 2008
Location: High Ridge, Missouri
Posts: 2,190
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Re: Dish Pistons + 64cc head = ??
Quote:
Will have to check into that at my local farm store.
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