Author Topic: tiat twin cam and 911 gearbox (Read 21685 times)

guy moerenhout · « **on:** August 22, 2007, 10:33:38 am »

with this transformation its easy to adopt a twin cam on a 911 gearbox and you have a 5 speed and the good direction of turning (right)Just take one part of gearbox ,one part of cluth housing of a 124 our 131 and weld this togheter .Its fits easy in the 850 chassis and have the right gearing
Best is the old +-1965/1977 models and with small cardans .You need to take the cluth plate from the 911 ,215 mm that works fine with the cluth cover from fiat idem size .

DaveA · « **Reply #1 on:** August 22, 2007, 05:21:51 pm »

looks good Guy

is that a 901 Porsche gearbox ? YES
or the later and bigger 915 gearbox ? NO TO BIG AND HEAVY

if it is the 901 the gear shifting pattern is

R 2 4 THIS DEPEND ON SHIFTER IHAVE NOW 4 2 R
5 3 1
1 3 5

Dave

DaveA · « **Reply #2 on:** August 22, 2007, 06:29:43 pm »

Hi Guy

I have driven 911s with the early shift pattern ,

I hate it for street driving where you need to use first gear often ,

its OK on the highway or race track.....

Dave

guy moerenhout · « **Reply #3 on:** August 22, 2007, 08:35:20 pm »

I have fun with each car that drives like I wish

flyingdirt · « **Reply #4 on:** August 23, 2007, 12:48:23 am »

Thanks Guy, looks straight forward enough. I still have some questions.
Which drive shafts are you using? XI/9 ?PANDA ETC MODIFID
Does the gearbox spline fit striaght into the 1400 twin cam? BIGGER BEARING
Are you using the 911 clutch with the 124 pressure plate. YES
I am sure I will have more questions as I go through the conversion (I hope you dont mind)I HAVE NO SECRETS LIKE YOU ALREADY SEE IN THIS FORUM

regards GUY
Chris

Hønne · « **Reply #5 on:** October 08, 2007, 04:44:11 pm »

I got really hook on the idea of upgrading the gearbox to the porsche transmission and then adding twincam engine. I know a guy who have a 901 porsche gearbox for sale. Futhermore a know another guy who have a 1600cc fiat Ritmo (105TC) for sale, but does this fit (And can you use the clutch housing from this engine)??

How hard is it to make the porsche gearbox fit? I have some basic mechanic skills but I havn't got that much knowlegde about tuning engines.

Maybe this project is just to big for me, but is there another (easier) way of getting some more horsepower out of a fiat 850?

Really hope you can help me..

jay · « **Reply #6 on:** December 02, 2007, 02:04:42 pm »

hi,if we convert the 911 gearbox,how about the drive shaft which car model do i need to use.by the way which 911 model gearbox is this.tq

guy moerenhout · « **Reply #7 on:** December 02, 2007, 05:03:58 pm »

you can use Panda,X1/9 ,BMW,Golf etc but always with adaptions ?It will not fit direct

flyingdirt · « **Reply #8 on:** February 13, 2008, 07:19:55 am »

Guy, Have you ever used a VW beetle gearbox?. If not would it work instead of a porsche one?

guy moerenhout · « **Reply #9 on:** February 13, 2008, 06:26:58 pm »

its bigger and higher than 911

flyingdirt · « **Reply #10 on:** February 14, 2008, 09:25:58 am »

Sorry Guy I am not sure what you mean

guy moerenhout · « **Reply #11 on:** February 14, 2008, 02:30:10 pm »

You have a limited place in a 850 base car and the VW gearbox is bigger than 901 box .In 600 the place is even smaller but is still possible for the 901 box

keithwwalker · « **Reply #12 on:** June 28, 2008, 11:37:39 pm »

I believe that Greg Schmidt (USA) used to sell adaptors for using a VW gearbox in the 850. I will have to read his book again to see what the limitations are.

abarthje · « **Reply #13 on:** December 28, 2008, 10:30:18 pm »

Hello Guy,

you did write that the axles are panda!
but thats only the outher (wheel) side.
is the gearboxside of the axle standard Porsche (witch are verry expensive) or is there a axle from VW that wil fit??

guy moerenhout · « **Reply #14 on:** December 29, 2008, 08:52:02 am »

the Lobro connections from Porsche 'old 911) VW golf,X 1/9 ,MOst LANCIA,Fiat Old type,Fiat 124 Abarth,early Fiat 131 Abarth, Ford Scorpione etc ALL are +_10 CM and the same .And not expencief

trevor · « **Reply #15 on:** December 29, 2008, 11:58:07 am »

1976 photos attached are of simple economic use of VW Beetle driveshafts with a VW beetle box in a white Fiat 850 coupe. Engine is Fiat 1500 of around 90-100 hp. Connection to 850 rear stub axle effected by welding CV flange to "star" shaped inner section of standard 850 flex joint. Axles were reliable over years of heavy use. VW beetle box required - minor- indentation in floor pan for clearance.
Yellow 850 coupe has 200hp Fiat 1995cc twincam with 5 speed conversion VW beetle box and so had twin CV driveshafts for higher power output. Has been very reliable in tarmac rally use.

grant gauld · « **Reply #16 on:** December 29, 2008, 05:28:24 pm »

Quote from: trevor on December 29, 2008, 11:58:07 am

1976 photos attached are of simple economic use of VW Beetle driveshafts with a VW beetle box in a white Fiat 850 coupe. Engine is Fiat 1500 of around 90-100 hp. Connection to 850 rear stub axle effected by welding CV flange to "star" shaped inner section of standard 850 flex joint. Axles were reliable over years of heavy use. VW beetle box required - minor- indentation in floor pan for clearance.
Yellow 850 coupe has 200hp Fiat 1995cc twincam with 5 speed conversion VW beetle box and so had twin CV driveshafts for higher power output. Has been very reliable in tarmac rally use.

Trevor,
Please correct me if i am wrong ? The yellow car looks like a car i competed against in Targa Tasmania 2000 and it broke down every day and failed to finish the 6 day event.Is it the same QLD car ?
Targa Tasmania (FIA) has since stopped allowing such 'specials' into its event as it was a long long way from the original car despite the owners claims.I only make this note for anyone thinking of putting such a dream into place and learning the bad news too late.A similar 124 spider 'special' was too hot and also got knocked back despite both cars being built in a professional manor.
Grant Gauld

trevor · « **Reply #17 on:** December 29, 2008, 10:03:07 pm »

Grant,
This thread arose on the subject of 911 transaxles and Fiat twincam engines, and includes references to use of VW transaxles similarly.
My comments were about transaxle/driveshaft reliability and stand.
Trevor

guy moerenhout · « **Reply #18 on:** December 31, 2008, 10:37:01 am »

hallo all,I have some problems with drive shafts in rally to .With the 500 abd 600.I find out the you can use the slave connecion from the cardan shaft on the side from the wheel to ,you must turn a litle out for a nut on inside .After this whe have no probleme anymore in rally with this

abarthje · « **Reply #19 on:** December 31, 2008, 01:18:12 pm »

Thanks Guy and Trevor,

the picture's from trever look good.
Trevor, the driveshafts, are they standard VW Beetle shafts???
or are they machined to fit the 850 body?
i already have a porsche 901 gearbox and i think the beetle driveshafts wil fit to the gearboxflanges.

regards and a happy new year to all......

trevor · « **Reply #20 on:** January 01, 2009, 04:03:40 am »

Abarthje,
The car was dismantled over 10 years ago, but I still have the driveshafts.
I will measure the shaft length and send it to you so that you can be certain on the standard VW beetle aspect.
Two body mods for those driveshafts:
a) the "opening out" or "spreading" of the faces of the trailing arm to clear the CV joint flange, as visible in the first photo of Dec 29 post.
b) shock absorber in the standard position behind the driveshaft had a threaded extension bottom rod to clear the CV diameter.
Trevor

grant gauld · « **Reply #21 on:** February 21, 2009, 08:34:08 am »

I have a pair of Fiat 600 rear A-arms modified to fit a Porsche 5 speed gearbox.100PCD which can easily be changed.Includes Girling calipers.I am selling them for a friend.200eu the pair (gearbox not included).Collect in Niew Vennep,Netherlands.grant_gauld@yahoo.com.au

roadsportusa · « **Reply #22 on:** April 07, 2010, 02:46:00 am »

I have a complete 124?850 fiat conversion kit for sale
located in new Jersey, USA. I will crate and pack all items for export, you pay the frieght

Kit includes:
PBS conversion installation instructions
rebuilt 1608 twin cam fiat engine(the best of all twin cams engines)
new 9:8 to 1 comm. pitons
new rod bolts and nuts
new water and oil pumps
new bearings and gaskets
PBS B-3 intake cam
PBS S-2 exhaust cam
Faza twin cam /850 tube header and muffler
VW super beetle transmission and custom axles, with trans. mounts.
One pair modifed rear hubs and control arms
VW short shifter
PBS adapter plate for VW trans
PBS engine mount/cross member, front mount radiator and coolant tubes
PBS side draft intake manifold, two rebuilt weber 40mm side draft carbs with mount kits
heavy duty clutch and spacer for VW trans
124 rear disc brake conversion kit
price $5,950 USA

Rubino · « **Reply #23 on:** January 15, 2013, 05:20:54 am »

Hi Roadsportusa ,
I know this was acouple of years back, did you sell everything?
Regards, Rubino