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Author Topic:   FM hyperutectic cc?
stang106
Gearhead

Posts: 314
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 03-01-2002 11:51 AM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
Can someone please check my math?
I have the Federal Mogul Hyperutectic flattops with four valve releases and am trying to figure out my compression ratio. The motor is a 351W .030 over, Felpro gaskets (.040?) and Windsor Junior heads with 58cc. I'm not sure how many cc below deck those pistons are?
Thanks,
Dave

------------------
'70 ragtop Stang
"I live my life 16.090 seconds at a time"

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Ron
Journeyman

Posts: 97
From: Newcastle, Wa.
Registered: Feb 2002

posted 03-01-2002 12:05 PM     Click Here to See the Profile for Ron     Edit/Delete Message   Reply w/Quote
easy... you do the math

swept volume + clearance volume divided by the clearance volume again

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Moneymaker
Administrator

Posts: 11493
From: Lyons, IL, USA
Registered: May 99

posted 03-01-2002 12:06 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Dave it will depend on you deck height. How far the piston is in the hole at TDC.

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Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link

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stang106
Gearhead

Posts: 314
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 03-01-2002 12:14 PM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
Alex,
yes, I know but the engine isn't together yet. I thought that someone has used this combination before and would know the answer. Its a 69 block. What would a good guess be for how may cc clearance volume? Then I could do the math!
Thanks,
Dave

------------------
'70 ragtop Stang
"I live my life 16.090 seconds at a time"

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Ron
Journeyman

Posts: 97
From: Newcastle, Wa.
Registered: Feb 2002

posted 03-01-2002 01:04 PM     Click Here to See the Profile for Ron     Edit/Delete Message   Reply w/Quote
put modeling clay in the valve reliefs then remove the clay and drop them into a measured cylinder. this will give you the cc of the reliefs (if the piston manufacturer doesn't provide them)

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stang106
Gearhead

Posts: 314
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 03-01-2002 04:22 PM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
OK, her's what I know so far- The machine shop said that I won't get 10:1 with these pistons on stock resized rods without decking. He said that he will measure it to see how far down the piston is, and parallel deck as needed. Also he said that the advertized 58cc chambers will also be bigger- I'll cc them to find out- and I still need to polish the chambers to ward off detonation, which will add a couple more.
So he figured to deck them at least .020 but he will do the math first. Is there an ideal ratio for this application?
Dave

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Ron
Journeyman

Posts: 97
From: Newcastle, Wa.
Registered: Feb 2002

posted 03-01-2002 04:43 PM     Click Here to See the Profile for Ron     Edit/Delete Message   Reply w/Quote
if you're paying for square deck make sure you get one and not just a standard old deck height job

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stang106
Gearhead

Posts: 314
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 03-01-2002 04:56 PM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
Thanks for the advice Ron, I know these guys well, and do trust them and their opinion. By the way, they charge $160.00 for a standard deck and $200.00 for a square deck. The bulk of their work is high performance, mostly mud racers and some circle track stuff.

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Moneymaker
Administrator

Posts: 11493
From: Lyons, IL, USA
Registered: May 99

posted 03-01-2002 06:39 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
If yo can get it down to a zero deck then you should get close to 10 to 1. If you give me the piston part number,and a head gasket thickness I can try and copute it for you as close as posible with 58 cc heads.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link

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stang106
Gearhead

Posts: 314
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 03-01-2002 07:39 PM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
Alex, Piston# H336P-030. Gaskets are Felpro 260-1028. I was told they would be .040. Do you advocate a zero deck? With the four large valve releases the pistons are almost dished.
Thanks,
Dave

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