924Board.org

tomcooper · Joined: 17 Feb 2004 Posts: 301 Location: Waterloo, Nebraska

Does anyone have a number for the deck height for a 924 block. By deck height I mean the distance between the centerline of the main bearings and the top of the cylinder block.

I have looked at almost all of the post that came up when I searched the term "Deck and Height", but none of them address this value. I have also looked in the Technical Specifications for the 924 models 78 -85.

Any help would be appreciated.

Thanks,

Tom
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Casper and Big Red, both 1980 NA
Black Bart, 1990 944 S2 Cab

tomcooper · Joined: 17 Feb 2004 Posts: 301 Location: Waterloo, Nebraska

I can't believe that after 57 hits there isn't someone that can answer this question. I have found a lot of information, but the stock deck height seems to be a international secret.

Tom
_________________
Casper and Big Red, both 1980 NA
Black Bart, 1990 944 S2 Cab

-nick · Joined: 16 Nov 2002 Posts: 2699 Location: Cambridge, MA

What is it you want the info for? If it's just for calculation, then you, or your machinist should be able to measure your own block pretty easily. If you're concerned about the deck being cut too much on your block, then you could probably get someone to measure the pan-to-deck distance on a known untouched block. In fact, the way the crank is bolted in, that number should be the same as the deck height you're after.
_________________
1980 931S
15psi boost, MS-II, EDIS, 951 IC, custom intake, Ford 5.0L throttle body, Forge BOV, WB o2, G31 w/LSD, 964 wheels, 968 rear sway, Bilsteins, 200# Welt. springs. A laptop, and a partridge in a pear tree.
1991 964 C4 Cabriolet

tomcooper · Joined: 17 Feb 2004 Posts: 301 Location: Waterloo, Nebraska

Nick,

We have calculated a number, now we would like to know how it compares to the publish figure. We are trying to determine why a particular configuration does not work on the block I have. It maybe that I just have a odd ball block, or there maybe a mistake in the machining of one of the components, figuring out which is going to be the trick.

Tom
_________________
Casper and Big Red, both 1980 NA
Black Bart, 1990 944 S2 Cab

leadfoot · Posted: Fri Mar 02, 2007 11:33 am Post subject:

This is not your average measurement covered in haynes... you will probably need the factory manual...
that being said, you will need to take into account if your block has been previously decked or had oversized bearings put in...
Leadfoot
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

Paul · Posted: Fri Mar 02, 2007 1:54 pm Post subject:

I couldn't find in the the 924 Turbo factory manual.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

tomcooper · Joined: 17 Feb 2004 Posts: 301 Location: Waterloo, Nebraska

Paul,

Thanks for looking. It's not in the set of manuals I have either. I am not sure were else to go, that's why I asked here. I have a spare block that I will have cross checked and if the numbers are anywhere close, I'll publish them here. With the current weather here in the midwest that may take some time.

Tom
_________________
Casper and Big Red, both 1980 NA
Black Bart, 1990 944 S2 Cab

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

stupid question from here, but what I'd do is measure the distance from the big-end to the deck in TDC and BDC, you know the stroke (i hope;) ) and with these measurements and one easy calculation you've got your actual deck height, not depending on the possibility that something has been modified like a deck grind or something.
The question is... how accurate can you measure

_________________
"Rule: Turbo's make torque, and torque makes fun." (C. Bell)

924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment

tomcooper · Joined: 17 Feb 2004 Posts: 301 Location: Waterloo, Nebraska

No, the question is what is the factory specification. We know what deck height we have measured, calculating the compression ratio using that value results in a ratio of greater than 11.5 to 1. Can you say racing fuel?

This is supposed to be a street engine that runs in a daily driver. Don't think that I can afford to pour $5.00 per gallon fuel in it.

Tom
_________________
Casper and Big Red, both 1980 NA
Black Bart, 1990 944 S2 Cab

Raceboy · Joined: 01 Mar 2004 Posts: 2327 Location: Estonia, Europe

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

euh... a gallon is about 4 litres? (3.7 says wikipedia)

here the prices were 1,50 EUR for one liter.
Times 4 is 6 euro's for 4 litres or one gallon.

6 euro's is about 8-10$ as far as I know... so that's twice the price.... for regular gasoline! (98 octane in my case)

(euh... wait...is racing fuel 98 octane at your side of the pond?)...
_________________
"Rule: Turbo's make torque, and torque makes fun." (C. Bell)

924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment