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Author
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Topic: Optimum compression?
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stang106
Gearhead Posts: 786
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 03-06-2002 02:22 AM
   
The block's at the machine shop and I'm crunching numbers. I need opinions on optimum compression ratios for a strong street/strip car. 351W, World JR 60 cc heads, 569/585 lift (card numbers). The best pump gas here is 92 octane. I still have to tell the machinist how far to parallel deck the block; I'm waiting for him to tell me his measured TDC from deck.
Thanks,
Dave------------------
'70 ragtop Stang
"I live my life 16.090 seconds at a time"
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 03-06-2002 11:32 AM
10 to 1 at a minimum. Compression is heat energy and heat energy is horsepower.  ------------------
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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John Kolhei
Journeyman Posts: 46
From: Cottonwood,mn,usa
Registered: Feb 2002
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posted 03-06-2002 07:55 PM
My engine builder said "If you can't afford race gas, Maybe you should stay home"
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bfxcomet
Gearhead Posts: 691
From: Port Alberni, B.C. , Canada
Registered: Mar 2001
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posted 03-07-2002 01:35 AM
Hey Dave finished your homework? I worked on T-bird, removed everything from trunk.
Roger ------------------
[url]www.avdra.bc.ca[url]
65 comet project
84 T-bird
Made in CANADA built for speed
#1145
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stang106
Gearhead Posts: 786
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 03-07-2002 02:30 AM
Roger,
how's the metal in the trunk? sound? I can't wait to see those bumpers lightened up.
Dave
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n2oMike
Gearhead Posts: 2831
From: Spencer, WV
Registered: Jan 2001
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posted 03-07-2002 06:48 AM
What are the 0.050" numbers and lobe seperation of the cam. Also, what pistons are you using? Flattops, ? Stick or auto? Converter? Intended usage?????You need to give more information to get reliable feedback. ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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SteveLaRiviere
Administrator Posts: 45869
From: Saco, Maine
Registered: May 99
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posted 03-07-2002 07:56 AM
quote:
Originally posted by John Kolhei:
My engine builder said "If you can't afford race gas, Maybe you should stay home"
Tell him if he can't make an engine run on pump gas, he should stick to Briggs&Strattons.  ------------------
'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
MCA Member # 47773
An optimist thinks that this is the best possible world. A pessimist fears that this is true.
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mellowyellow
Gearhead Posts: 7367
From: So. Fl.
Registered: Aug 2000
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posted 03-07-2002 09:27 AM
Knew there'd be a comment to the stay at home remark!! LOL!
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stang106
Gearhead Posts: 786
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 03-07-2002 10:43 AM
Cam is a comp, duration at .050 239/247. Lobe life .356/.366, gross valve lift .569/.585. LS 110 degrees.
Valve timing at .050:
INT open 13BTDC close 45ABDC
EXH open 57BBDC close 9 ATDC
Pistons are FM hyperutectic flatops with four valve releases. Stock bottom end. C4 with 2500 stall. 323 gears in a possi 9"only beacuse I have little 24"tires, will chage gearing when I get larger Magnum 500's. Car is a family driver around town on sunny days. Will see about 3-4 1/4 mile strip days a year.
Thanks,
Dave
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gt350mike
Journeyman Posts: 12
From: Huntsville, AL
Registered: Feb 2002
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posted 03-07-2002 01:44 PM
quote:
Originally posted by stang106:
Cam is a comp, duration at .050 239/247. Lobe life .356/.366, gross valve lift .569/.585. LS 110 degrees.
Valve timing at .050:
INT open 13BTDC close 45ABDC
EXH open 57BBDC close 9 ATDC
Pistons are FM hyperutectic flatops with four valve releases. Stock bottom end. C4 with 2500 stall. 323 gears in a possi 9"only beacuse I have little 24"tires, will chage gearing when I get larger Magnum 500's. Car is a family driver around town on sunny days. Will see about 3-4 1/4 mile strip days a year.
Thanks,
Dave
I have the same question on CR. Using his motor as a reference, what is the max CR if I use 93 octane and I'm running aluminum heads ?
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Ron
Gearhead Posts: 137
From: Newcastle, Wa.
Registered: Feb 2002
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posted 03-07-2002 05:18 PM
quote:
Originally posted by SteveLaRiviere:
Tell him if he can't make an engine run on pump gas, he should stick to Briggs&Strattons.
Makes me remember one of my dumb moments, I was mowing the lawn and the mower ran out of fuel, I went to get the can and it was empty so being my lazy self and not wanting to run up to the gas station I looked over at the can marked VP sittin in my garage and said to myself "whats the difference?" I've never seen a lawnmower run so terribly in my entire life, smokin, spittin, coughin, I thought... MY GOD I KILLED IT!
It was fine after I went and got regular gas and diluted it.
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steve'66
Gearhead Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-07-2002 06:00 PM
quote:
Originally posted by gt350mike:
I have the same question on CR. Using his motor as a reference, what is the max CR if I use 93 octane and I'm running aluminum heads ?
10.5 maybe a little more if you modify the spark curve carefully. SteveW
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John Kolhei
Journeyman Posts: 46
From: Cottonwood,mn,usa
Registered: Feb 2002
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posted 03-07-2002 07:18 PM
Steve; we do burn some pump gas in the Briggs and even in the tow truck when we take the Ford Racing.
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