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simsport
Joined: 06 Nov 2002
Posts: 573
Location: UK Warrington
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 Posted: Wed Dec 18, 2002 11:49 am Post subject: EFI |
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I have read how a few folk are putting together an EFI sustem for the 931.
I have used the Emerald system made here in the UK for some time and its cost at about £600 seems reasonable.
It is a bit involved to retro fit and EFI system granted but it does give more power and torque albeit its main gain comes when you want to tune beyond the capability of the standard system.
Dave Walker who made the system has written a book which inckudes a CD for your PC to enable you to try the system out before you buy and to try a little mapping.
I have maps for igntion only management (with a distributor) and for full EFI in distributorless format also and am willing to print them off to show anyone who has an otherwise standard engine what figures on ignition and fuel(with Porsche 944 injectors) I arrived at to get 200+ bhp with a supercharger, in case anyone is interested.
For some reason the map wont transport to my email account but I can print it off and send it to either an indivdual or a person on the list who could copy it to the site pages.
Just a thought.
Cheers
Simon
PS I am rebuilding my engine over the next month or two and have now got all the brackets etc I made for the blower off it. Willing to digital photo the stuff and email to individuals too. Its all looking a bit well used now after 3 years or hard charging (pun!) but maybe of use to anyone contemplating a blower fittment.
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simsport
Joined: 06 Nov 2002
Posts: 573
Location: UK Warrington
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| Posted: Wed Dec 18, 2002 11:53 am Post subject: Spelling |
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Why is that late at night when I get the time to send messages they look ok and then when they appear they have typo errors in?..............old, thats me!... 
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sandgroper
Joined: 07 Dec 2002
Posts: 95
Location: in limbo
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| Posted: Thu Dec 19, 2002 9:28 am Post subject: |
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| AAHHHH Dave Walker FORD ESCORT GURU,Simmo is their any cheap (yeah right) source for 931 pistons over in the U.K. |
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simsport
Joined: 06 Nov 2002
Posts: 573
Location: UK Warrington
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| Posted: Wed Jan 08, 2003 10:12 am Post subject: Pistons |
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I am very sorry for the delay in getting back to you.
Regarding the psitons there is no supply for new pistons here. There are a few sets of used pistons in good shape, or so we are told. Trouble is it is such a gamble going that way.
JE seems the best bet.
I am sure Mahle would run pistons off their production line if they felt they had enough demand. However they would cost and if JE are as good or better then why bother.
My friend here has bought a 2.4 kit which uses golf (vw rabbit) rods. these are required for the 2.4ltr conversion. However they are a lot lighter than the std rods. Has anyone over at your end made lighter rods to fit the std engine?
Cheers
Simon
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Matias
Joined: 08 Nov 2002
Posts: 30
Location: Argentina
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| Posted: Sat Jan 11, 2003 1:53 pm Post subject: Re: Pistons |
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| simsport wrote: | I
My friend here has bought a 2.4 kit which uses golf (vw rabbit) rods. these are required for the 2.4ltr conversion. However they are a lot lighter than the std rods. Has anyone over at your end made lighter rods to fit the std engine?
Cheers
Simon |
What does the 2.4 kit includes? You can reach 2.4 L without changing the crank? |
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jpab924
Joined: 03 Nov 2002
Posts: 1538
Location: Crown pt. IN. 50 miles southeast of Chicago Ill.
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924 turbo
Joined: 02 Nov 2002
Posts: 1566
Location: Simi Valley, CA, USA
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| Posted: Sat Jan 11, 2003 7:12 pm Post subject: |
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Bah. The reserve is probably too high. I'd rather have a set of JE pistons made if I were going to spend over $500. We'll see.
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Jon Furst |
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sandgroper
Joined: 07 Dec 2002
Posts: 95
Location: in limbo
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| Posted: Tue Jan 14, 2003 9:40 am Post subject: |
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Simmo,i run datsun L16rods and vw aircooled forged 92mm pistons in my 2.0 escort,got the vw piston bit from guru dave.With my 931 i am looking at mitsubishi rods,offset grinding crank and custom pistons,early stages yet cause i want to make sure i get ideal rod stroke ratio so am working through the numbers,my haynes manual says a stock rod weighs 815 to 927gms can anyone confirm this,lighter rods and pistons would help this engine alot.
By the way this mob should be in links www.sivalves.com, they make valves and valve guides,they also have a nice metric conversion chart download i hope Peter takes note.
Looking at a spare 931 flywheel i would like to lighten but geee their is not much pork on there to take off,has anyone had a go maybe john H.What have you done with your flywheel simmo,has anyone tried expensive centerforce clutch,regards |
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Peter_in_AU
Joined: 29 Jul 2001
Posts: 2740
Location: Sydney, Australia
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| Posted: Tue Jan 14, 2003 1:19 pm Post subject: |
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hey sandgroper, don't be lazy post the link in the links forum yourself. Anyone can post there.
What flavour of mitsubishi motor are you looking at for the rods?
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1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)
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john h
Joined: 06 Nov 2002
Posts: 827
Location: Wellington New Zealand
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| Posted: Tue Jan 14, 2003 3:02 pm Post subject: |
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| sandgroper wrote: | | Looking at a spare 931 flywheel i would like to lighten but geee their is not much pork on there to take off,has anyone had a go maybe john H.What have you done with your flywheel simmo,has anyone tried expensive centerforce clutch,regards |
On teh GT replica I have a Genuine GT flywheel which allows the use of the 911 clutch plates etc. Not sure what the guys did to it when the motor was built.
On teh new race motor I'm going to be modifying the flywheel to take 911 stuff as well. I don't like the paddle clutches most of the 931 guys run over here for racing hence the requirment to use modify the flywheel. Probably lighten it at the same time - but thhis work is due until latter this year (after the racing season is completed here)
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sandgroper
Joined: 07 Dec 2002
Posts: 95
Location: in limbo
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| Posted: Thu Jan 16, 2003 10:02 am Post subject: |
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| peter,the early 4G63 mitsi engine,150mm c-c length,48mm big end bore,should be an easy rod to utilise.Can anyone tell me if a 924 weber manifold will bolt up to a 931 head,please |
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Peter_in_AU
Joined: 29 Jul 2001
Posts: 2740
Location: Sydney, Australia
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| Posted: Thu Jan 16, 2003 1:11 pm Post subject: |
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| Quote: | | if a 924 weber manifold will bolt up to a 931 head |
No. The 931 port mouths are different, the roof has been raised slightly and the floor has been filled in so the port is almost circular not oval like the 924 (just a good porting job really).
The manifold mounting studs are slightly wider apart on the 931 (say about 3mm).
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1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)
Learn to love your multimeter and may the search be with you |
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simsport
Joined: 06 Nov 2002
Posts: 573
Location: UK Warrington
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| Posted: Fri Jan 24, 2003 11:21 am Post subject: Flywheel |
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I had about 2 kilos taken off my flywheel but as you say it is a bit tight to find much material to remove.
Peter, 4g63 mitsu rods eh, well I have a vr4 circa 1990 so if it goes pop and the rods are I may well use mine!
Chers
Simon
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924 FAQ (Technical)
