Chambersize and comp (stock heads)? and mill??

02-10-2001, 05:10 AM

I want to mill my heads little...? how much can I mill? We have 95-98 octane petrol here. 0,30 mill how much in comp will that do???

------------------
-87 GT, K&N, 5-speed, Walker exhaust, no air silencer. timing
75000miles. This vinter 3,55 and mac 15/8 and H-pipes
14,61 and 95,59mph

Mach 1 · 02-10-2001, 07:03 AM

Yeah, living in Sweden, you have the good gas, like Europe. You can raise your compression probably to 11:1 with the good gas available. You will have to ask a machine shop to figure out the specifications. You probably need to mill .060 or more.

02-10-2001, 08:47 AM

goog gas but expencive! I need to know my chambersize to calculate....? anyone?

02-10-2001, 08:54 AM

goog gas???? Good I mean

ponypower · 02-10-2001, 10:24 AM

with KB Silvolite 110 pistons, .030 over bore and stock heads milled .055 you will have around 10.5:1 compression. this is my setup. if you mill anymore than .055 you have to mill your intake to make up the difference. if you go less than .055 the intake will not be affected. i run pump gas 93 octane.

good luck

------------------
90 LX, LOTS OF EXPENSIVE TOYS, FRESHLY REBUILT THIS WINTER, RAN 13.10'S LAST SUMMER, LOOKING FOR 12.80'S THIS YEAR. THAT'S WITH AN AOD, DAILY DRIVEN
PonyPower
<A HREF="http://www.mustangworks.com/cgi-bin/ViewIt.cgi?http://www.mustangworks.com/cgi-bin/moi-display.cgi?269" TARGET=_blank>1990
Mustang LX</A>

moosejaw · 02-11-2001, 01:29 AM

Stock heads are 64cc. Trick Flow twisted wedge,for example, is 62cc. Use the 64cc and stock compression of 9.0:1 to calculate how much to shave. Don't go over 10.5:1 compression.

Although you say you have 95-98 octane, is the octane rating the same units as we use in the U.S.? If the units are different you may not be able to raise your compression much at all.

Look in the tech articles for the gasoline discusion for the different types of gas ratings.

Does this answer your question?

mike

2FastLX · 02-11-2001, 03:31 AM

I asked this exact same question awhile back and decided to go for a .030 shave and was told it would be close to 9.5:1 compression. I too never got a direct answer as to the exact compression with .030 shaved, only guesses. But that'll do for me I "guess"

------------------

88workcar · 02-11-2001, 07:33 AM

With mine shaved .030, with stock pistons, 1.94 / 1.60 valves, and the E cam. I had 180PSI on every cylinder. It ran 12.60 @ 108. with a B cam, I have not track tested with the E yet.

------------------
88workcar
1988 Mustang LX - 12.17 @ 112 MPH!

Beni · 02-11-2001, 06:09 PM

due to the production variances in the E7TE casting, the chambers have been measured from 60.6cc to 63cc. Pull them and use liquid to fill them up. This is the poor mans way to do it. If you take them to a machine shop they can do it for you.

------------------
86GT bastard car w/83front,91 glass, 92 LX taillights, and a pile of parts
stock 86shortblock, stock cam, ported E7TEs, longtubes, and an attitude

93 Taurus SHO (stock)
jojo@gibralter.net

Rev · 02-11-2001, 06:22 PM

You need to know what the deck height is in your engine and the compressed thickness of the head gasket is to really know what the static compression is. The "deck height" is the measurement of how far down in the bore the piston is at TDC. If you don't know these measurements, then static compression is just a guess.

Rev

------------------
'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

02-10-2001, 05:10 AM	#1
joakim Guest Posts: n/a	Chambersize and comp (stock heads)? and mill?? I want to mill my heads little...? how much can I mill? We have 95-98 octane petrol here. 0,30 mill how much in comp will that do??? ------------------ -87 GT, K&N, 5-speed, Walker exhaust, no air silencer. timing 75000miles. This vinter 3,55 and mac 15/8 and H-pipes 14,61 and 95,59mph

02-10-2001, 07:03 AM	#2
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	Yeah, living in Sweden, you have the good gas, like Europe. You can raise your compression probably to 11:1 with the good gas available. You will have to ask a machine shop to figure out the specifications. You probably need to mill .060 or more.

02-10-2001, 08:47 AM	#3
joakim Guest Posts: n/a	goog gas but expencive! I need to know my chambersize to calculate....? anyone?

02-10-2001, 08:54 AM	#4
joakim Guest Posts: n/a	goog gas???? Good I mean

02-10-2001, 10:24 AM	#5
ponypower Registered Member Join Date: Mar 1999 Location: Fayetteville, NC Posts: 206	with KB Silvolite 110 pistons, .030 over bore and stock heads milled .055 you will have around 10.5:1 compression. this is my setup. if you mill anymore than .055 you have to mill your intake to make up the difference. if you go less than .055 the intake will not be affected. i run pump gas 93 octane. good luck ------------------ 90 LX, LOTS OF EXPENSIVE TOYS, FRESHLY REBUILT THIS WINTER, RAN 13.10'S LAST SUMMER, LOOKING FOR 12.80'S THIS YEAR. THAT'S WITH AN AOD, DAILY DRIVEN PonyPower <A HREF="http://www.mustangworks.com/cgi-bin/ViewIt.cgi?http://www.mustangworks.com/cgi-bin/moi-display.cgi?269" TARGET=_blank>1990 Mustang LX</A>

02-11-2001, 01:29 AM	#6
moosejaw Registered Member Join Date: Apr 1999 Location: St.Louis,MO Posts: 274	Stock heads are 64cc. Trick Flow twisted wedge,for example, is 62cc. Use the 64cc and stock compression of 9.0:1 to calculate how much to shave. Don't go over 10.5:1 compression. Although you say you have 95-98 octane, is the octane rating the same units as we use in the U.S.? If the units are different you may not be able to raise your compression much at all. Look in the tech articles for the gasoline discusion for the different types of gas ratings. Does this answer your question? mike

02-11-2001, 03:31 AM	#7
2FastLX The Photoshop Guru Join Date: Feb 2001 Location: Mecca, Indiana Posts: 1,419	I asked this exact same question awhile back and decided to go for a .030 shave and was told it would be close to 9.5:1 compression. I too never got a direct answer as to the exact compression with .030 shaved, only guesses. But that'll do for me I "guess" ------------------

02-11-2001, 07:33 AM	#8
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	With mine shaved .030, with stock pistons, 1.94 / 1.60 valves, and the E cam. I had 180PSI on every cylinder. It ran 12.60 @ 108. with a B cam, I have not track tested with the E yet. ------------------ 88workcar 1988 Mustang LX - 12.17 @ 112 MPH!

02-11-2001, 06:09 PM	#9
Beni Registered Member Join Date: Oct 1998 Location: Jacksonville, NC(station) and Tampa FL Posts: 37	due to the production variances in the E7TE casting, the chambers have been measured from 60.6cc to 63cc. Pull them and use liquid to fill them up. This is the poor mans way to do it. If you take them to a machine shop they can do it for you. ------------------ 86GT bastard car w/83front,91 glass, 92 LX taillights, and a pile of parts stock 86shortblock, stock cam, ported E7TEs, longtubes, and an attitude 93 Taurus SHO (stock) jojo@gibralter.net

02-11-2001, 06:22 PM	#10
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	You need to know what the deck height is in your engine and the compressed thickness of the head gasket is to really know what the static compression is. The "deck height" is the measurement of how far down in the bore the piston is at TDC. If you don't know these measurements, then static compression is just a guess. Rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi.