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Author Topic:   High compression questions
Kyle
Gearhead

Posts: 400
From: Sumner, WA
Registered: Dec 2001

posted 02-25-2004 02:29 PM     Click Here to See the Profile for Kyle   Click Here to Email Kyle     Edit/Delete Message   Reply w/Quote
I'm looking at purchasing a 347 stroker kit, for the Fairlane, made up of Scat cast crank and I-beam rods, and Keith Black dome pistons. The pistons have a 10.6cc hollow dome, and, taking into account the 60cc Victor Jr. head chambers and a .041" compressed head gasket, and a -.015 deck, would put me at right about a 13.3:1 compression ratio.

So, with the aluminum heads and an iron block:

-What octane fuel will I most likely need to use?

-Are there any special timing requirements when running a comp. ratio that high?

I know that detonation really needs to be kept under control, espically with hyperutectic pistons.

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Kyle Laramore

'63 Fairlane: Under Re-construction

'66 Mustang Coupe: 289, Offy intake, Crane Blazer hyd. camshaft, Autolite 4100 carb, Headman long tube headers, 3spd tranny, 8" rear, 3.80 gears

'70 Mach 1: 351C-2V, Weiand intake, 750 holley, Flowtech long-tube headers, MSD ignition, C6 trans, CJ converter, 9" track-loc rear, 3.50 gears, Flowmaster 2.5" mandrel exhaust w/ 3-chamber mufflers

Words to build engines by: "Never Assume!"

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steve'66
Gearhead

Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000

posted 02-26-2004 05:20 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
114 octane Kyle, or alcohol.

I don't like hyper pistons above 8-1 compression.

SteveW

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Tea'sGrabber
Gearhead

Posts: 276
From: Seattle, Wash.
Registered: Feb 2003

posted 02-26-2004 06:08 PM     Click Here to See the Profile for Tea'sGrabber   Click Here to Email Tea'sGrabber     Edit/Delete Message   Reply w/Quote
Kyle... Are you saying the piston is.015 below the deck or are you taking .015 off the block???? 13.3:1 is alot of compression with a KB piston. To take advantage of it your going to have to spin the motor pretty high... I'm real close to 13:1 and and I run VP C-16 or C-14+.... My timing is locked out @ 35....

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Todd 71 Mav Grabber All orig 306 cu.in. Cast Iron heads. Carillo Rods.Best et. 10.71 @ 124 thru the mufflers.
http://mustangsandmore.50megs.com/MembersPics/TeasGrabber.html

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Kyle
Gearhead

Posts: 400
From: Sumner, WA
Registered: Dec 2001

posted 02-26-2004 06:27 PM     Click Here to See the Profile for Kyle   Click Here to Email Kyle     Edit/Delete Message   Reply w/Quote
The piston is will be .015 down in the block. Do you not like a KB piston at that compression because of the increased possibility of detonation?

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steve'66
Gearhead

Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000

posted 02-26-2004 08:54 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Kyle:
The piston is will be .015 down in the block. Do you not like a KB piston at that compression because of the increased possibility of detonation?

Raising the compression increases combustion chamber pressure just like a little boost or a shot of n2o. Sure it increases the chance of detonation, and the increased h.p. and rpms. KBs are for street engines not race engines. IMHO anyway, Melissa has a necklace from a small piece of BBC piston from a rival of hers. It was the largest chunk of his KB piston with a hole drilled in it on a string. It is expremely light weight stuff. She won't let it get near the Mustang, it's like cryptonite.

SteveW

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Tea'sGrabber
Gearhead

Posts: 276
From: Seattle, Wash.
Registered: Feb 2003

posted 02-27-2004 11:24 AM     Click Here to See the Profile for Tea'sGrabber   Click Here to Email Tea'sGrabber     Edit/Delete Message   Reply w/Quote
.015 in the whole will probably promote detonation at that CR. you could probably get away with a forged flat-top if you zero deck them and mill the heads a bit. have you bought all your pieces yet??? If not... my motor's 4 sale???????? it's fresh and alot cheaper than were you going....

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Todd 71 Mav Grabber All orig 306 cu.in. Cast Iron heads. Carillo Rods.Best et. 10.71 @ 124 thru the mufflers.
http://mustangsandmore.50megs.com/MembersPics/TeasGrabber.html

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SteveLaRiviere
Administrator

Posts: 43152
From: Saco, Maine
Registered: May 99

posted 02-27-2004 02:56 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
That kind of compression ratio with hypers is suicide.

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'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip

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Kyle
Gearhead

Posts: 400
From: Sumner, WA
Registered: Dec 2001

posted 02-27-2004 04:07 PM     Click Here to See the Profile for Kyle   Click Here to Email Kyle     Edit/Delete Message   Reply w/Quote
Well, I think i'm going to ditch the hyper piston idea. I wasn't too happy about using those types of pistons anyway. I mean, why would you buy a part that you know has a history of breaking up? I've heard all the stories about hyper pistons vs. forged pistons, and I would rather save for the forged ones.

Tea's: I have the Vic. Jr heads, but I havn't bought any of the other parts yet. I am interested in what you are selling, so I will email you.

Thanks all for guiding me in the right direction!

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