abarth squadra storica forum

abarth cars , our in museum => Autobianchi Group II => Topic started by: Pawel Sokolowski on November 24, 2003, 11:09:14 AM

Title: car is ready
Post by: Pawel Sokolowski on November 24, 2003, 11:09:14 AM
Car is ready and thats the engine photos from owner




Title: Autobianchi Tuning
Post by: rkh on November 30, 2003, 11:32:33 PM
I'm indeed very impressed!

And I really hope you'll keep us informed of the progress on this car, and give us some information about the performance!
Title: car is ready
Post by: Black_Panther on December 02, 2003, 10:50:52 AM
beautifull car. j have driven such one but it's condition was rather bad tjan good. now it is hidden i the garage and waits for some cach flow in owners hand. we have made some good races in this car. i was realy surprised how fast can it accelerate.

the job you have done on jor car is worth of congratulation. can you write some detail of the engine on pramateres??

greetengs :)
Title: a112 groep2
Post by: guy moerenhout on December 02, 2003, 11:56:32 PM
Ok,special cilinderhead ,valves,springs ,spring holders,camshaft  2x36 webers,exhaust header,5speed,4disque brakes,rolcage, race seats ,body welding,wingextentions ,cromodora 5x13, etc;;;;
Title: Cilinderhead
Post by: Luke on March 01, 2004, 11:00:29 AM

i'm working on a abarth engine for my 127 Surf (a portuguese mk2 model)
what changes did you do to the cilinderhead?
is it a one off item or do you manufacture?

i have an abarth kit (valve cover/intake for a DMTR) but i would like to use 2 twin carburettors instead

i'm also searching for abarth valve springs (rated 12.000rpm) do you know where i can find them?
Title: A112
Post by: guy moerenhout on July 21, 2004, 10:46:06 PM
12000 is it not to high ? stay 1 carbur. 36/36 and this gos good with good cam  and high comprestion
Title: my 127 specs
Post by: Luke on July 22, 2004, 10:25:38 AM
i have a brand new a112 abarth(70hp) cam for my engine, the carbs i have at home are DMTR 32/34 if i'm not mistakended the pistons are stock, i'm trying to find the belt for the belt distribution kit but i cant seem to get my hands on one, do you recon i should upgrade the valve springs? or will the stock ones work for me, the cilinder head is polished and ported and it has big valves, what kind of performance can be expected from such a preparation? the bottom end of the engine is fully lightened, polished and balanced
Title: Upgrading A112 motor.
Post by: Scuderia Topolino on November 06, 2004, 04:04:49 PM
With regard to the A112 motor, there is one item that I would definitely replace, the connecting rod bolts.  In 2004 I witnessed at least 5 wngine failures directly caused by standard bolt failures.

As far as upgrades to the A112 motor, it all depends what you plan to do with it.  The standard valve springs (presuming that they have not run a couple of hundred thousand miles are quite OK for 7500 RPM.  Above that you need better.  Rather than talk about types or color coded springs, let look at specifications.  Valve closed seat pressure should be 70 PSI, valve fully open 260 PSI.

If the application is for the street, then the standard A112 70HP camshaft is quite good.  I hear people using 230 degree camshafts.  Well if you are doing all out racing, have a very close ratio gearbox and are willing to keep the RPMs between 7000 and 10,000 RPM, then this cam might work well.  Don't go for too much duration or it will hurt driveability.  If you do want to change to a BIGGER cam, I would recommend something that has a little bit more duration, and more lift.  By going with more lift and then some more duration the total valve opening period will be increased markedly.

For more information on engine building please visit my website at
Title: Re: car is ready
Post by: Paul vander Heyden on December 13, 2009, 02:33:16 PM
I noticed a misprint in my earlier comment.  The cam reference should have been 320 degrees, not 230  degrees.

Title: Re: car is ready
Post by: Henrik Vind on May 19, 2010, 08:57:23 AM
Hello from Denmark.

I know it's an old post, but I hope you still can help.

I have about the same setup

40 mm DCNF
32 valves in
29 valves out
4-1 manifold
302 degree camshaft with 7,2 hub

Im having BIG problems with the engine.
IIt's running to fat on low Rpm and VERY lean on high Rpm.

I have tryed emulsiontubes F22, F24, F25, F30, F33 and F36 but the diffrence is so big that it have to be fixed mekanicly. I'ts to big to change only by the tubes.

Witch tubes and jets have you used in your setup?

(I allsow have a set of 36 mm DCNF if needed)

Thank you.

Here is som pictures.







Title: Re: car is ready
Post by: guy moerenhout on May 19, 2010, 09:18:49 AM
I have use the 36 model
Title: Re: car is ready
Post by: Henrik Vind on May 19, 2010, 10:25:05 AM
Yesterday I mounted the 36 mm - same problem!

That's why I'm running out of ideers....
Title: Re: car is ready
Post by: grant gauld on May 21, 2010, 01:20:31 AM
          It is all in the set up of your carbs.I think you need smaller chokes/venturis (both 36 or 40 mm carbs are fine).If the cam is dialed in correctly a professional dyno can get that set up running very well.