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Author
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Topic: dished pistons??
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MrWesson22
Gearhead Posts: 610
From: Dacula, GA
Registered: Sep 2000
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posted 12-07-2001 10:17 AM
   
I popped the heads last night on my cleve, and I've got dished pistons in there. I was told when I bought the motor it had flat tops and was 10.7:1. I guess we all know how that goes, huh?? I do have D0AE heads. When I get home tonight, I'll snap a pic or two with the dig cam and hopefully someone will recognize them and maybe give me a guess as to what kind of compression I actually have. I guess the silver lining on this cloud is that the lower compression will be better for n2o. Anyone want to make any kind of ballpark guess as to what kind of CR I might have here?? I've got no clue at this point. Thanks.
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Neal
Member #723
[email protected] AIM: MrWesson22 69 Gulfstream Aqua Grande
351C/Toploader 4sp
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Moneymaker
Administrator Posts: 11493
From: Lyons, IL, USA
Registered: May 99
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posted 12-07-2001 10:43 AM
8 something to 1 would be my guess.  ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
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SteveLaRiviere
Administrator Posts: 21832
From: Saco, Maine USA
Registered: May 99
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posted 12-07-2001 01:04 PM
I can't see them that good from here...  ------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
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Mpcoluv
Gearhead Posts: 337
From: Charlotte NC usa
Registered: Apr 2001
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posted 12-08-2001 10:33 AM
I think the factory 10.7:1 pistons have a small dome. Flat tops should get you into the 10:1 range, so I would guess you would have 9:1 depending on the dish.
You really need to know the volume of the dish to accurately determine your compression.
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kid vishus
Gearhead Posts: 1994
From: huh?? what? who? ME!?!?!?!
Registered: Oct 2000
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posted 12-08-2001 10:57 AM
If they are the old TRW forged dished piston (part # L2416F), they are advertised as 9.47-1 with a 63 cc head. If your heads are a "typical" closed chamber head, (not milled any) they should be around 67 cc's, those pistons should give you around 9-1. (based on the Federal Mogul catalog) If you were to cut a little off your heads, and deck the block to zero, you should be able to get 10-1 with them. I have a set of them. And plan on using them again once I get some funds available to put another motor together.
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badazzcougar
Gearhead Posts: 132
From: Seattle
Registered: Oct 2001
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posted 12-08-2001 11:03 AM
since you have the closed chamber heads flattops would give you the 10.7 assuming zero deck. The dished pistons would probably put you in the 9.8 to 10 range .
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Moneymaker
Administrator Posts: 11493
From: Lyons, IL, USA
Registered: May 99
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posted 12-08-2001 11:39 AM
Don't forget to add the gasket thickness.  ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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kid vishus
Gearhead Posts: 1994
From: huh?? what? who? ME!?!?!?!
Registered: Oct 2000
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posted 12-08-2001 12:55 PM
quote:
Originally posted by Moneymaker:
Don't forget to add the gasket thickness.
I was taking that into account, assuming the 1013 Fel-pro gasket, which is listed at 8.8 cc's.
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chips67
Gearhead Posts: 537
From: louisville, ky, usa
Registered: Jul 2001
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posted 12-08-2001 08:49 PM
ive always read that flatops and dished pistons are better than domes from a physics standpoint. the other thing (which is just a side point) is that cast pistons are better than forged or hyper. pistons on a naturally aspirated motor because they are lighter. was thinking of going to cast flatops when i rebuild my 5.0 motor in my 67. ------------------
67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.
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