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Qky
Joined: 29 May 2006
Posts: 44
Location: Serbija
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 Posted: Thu Nov 09, 2006 11:25 am Post subject: Twin spark on 924 ? |
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I have one insane idea!
Is ti possible (is there enough space) to drill 924 engine head for second line of spark plugs (pleced like on 931 engine)!?
Alfa Romeo have about +20hp and about 10% less fuel consumption on twin spark engines, with same engine design!  
Have anybody try something like it, or I'm just F#^@$% up in head  ? |
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Tigger937
Joined: 11 Apr 2004
Posts: 919
Location: PCA Milwaukee Region
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| Posted: Thu Nov 09, 2006 12:47 pm Post subject: |
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Well, apparently Porsche agrees with you as they thought it was good enough to do in a 911. I think you're chartering new territory here.......................sounds like a project for OOTB! 
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1981 931 (Concours)
1982 931 (Daily Driver)
"Think outside the box" |
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AppleBit
Joined: 16 Nov 2002
Posts: 1516
Location: Minneapolis, MN
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| Posted: Thu Nov 09, 2006 1:42 pm Post subject: Re: Twin spark on 924 ? |
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| Qky wrote: | I have one insane idea!
Is ti possible (is there enough space) to drill 924 engine head for second line of spark plugs (pleced like on 931 engine)!?
Alfa Romeo have about +20hp and about 10% less fuel consumption on twin spark engines, with same engine design!
Have anybody try something like it, or I'm just F#^@$% up in head ? |
I talked with a guy years ago who converts VW engines into airplane engines- you need two spark plugs and he does this - he looked at my head and said with A LOT of work, it is possible.
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Classic British Sports Car Restoration v6 + v8 Engine Conversion Swaps
Porsche 924 Wide Body LS1 Corvette 500 Horsepower Engine |
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Raceboy
Joined: 01 Mar 2004
Posts: 2327
Location: Estonia, Europe
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| Posted: Thu Nov 09, 2006 4:47 pm Post subject: |
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I'm planning this on my 931 head. It improves flame propagation by a good amount.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold 
'84 924, turbocharged, sold.
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Qky
Joined: 29 May 2006
Posts: 44
Location: Serbija
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| Posted: Sat Nov 11, 2006 5:59 am Post subject: |
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Have anybody pics of 931 engine head "on table"?
I would like to see how spark ports "stand"  |
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Khal
Joined: 26 Sep 2003
Posts: 4872
Location: Sunny and lovely interior BC, Canada
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| Posted: Sat Nov 11, 2006 8:01 pm Post subject: |
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| Raceboy wrote: | | I'm planning this on my 931 head. |
Can you detail how you're going to do that? |
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Raceboy
Joined: 01 Mar 2004
Posts: 2327
Location: Estonia, Europe
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| Posted: Mon Nov 13, 2006 12:34 am Post subject: |
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| Khal wrote: | | Raceboy wrote: | | I'm planning this on my 931 head. |
Can you detail how you're going to do that? |
On the spare head of course 
Anyway, I have a non-repairable 931 head and I give this to my machinist guys who cut it to half to measure the exact spots, where to drill the holes. They've been done this for a number of times on various cars, so it shouldn't be too big of a problem.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche |
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StienbargerR
Joined: 28 Oct 2005
Posts: 1362
Location: Richmond, IN
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| Posted: Mon Nov 13, 2006 3:14 am Post subject: |
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This would also need an aftermarket ignition system, correct?
Ryan
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1978 924 NA
-250lb lowering springs, Euro Pistons |
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Raceboy
Joined: 01 Mar 2004
Posts: 2327
Location: Estonia, Europe
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| Posted: Mon Nov 13, 2006 3:27 am Post subject: |
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You could retrofit some 8cylinder ignition system to 924, but it's a waste of time and money. For that cost and time it's easier to convert to EFI injection and ignition.
| StienbargerR wrote: | This would also need an aftermarket ignition system, correct?
Ryan |
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche |
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Qky
Joined: 29 May 2006
Posts: 44
Location: Serbija
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| Posted: Mon Nov 13, 2006 10:15 am Post subject: |
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U can use alfa's electronic ignition!
Stake out 924's ignition, bung hole on engine head, mount alfa's ignitio ( it have 8 spark plug cables ) & tdc-sensor on pulley (from crankshaft)!
U can close calculation in 150-200€ |
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924 FAQ (Technical)
