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Suggested Head torque for a Fiat 131 Abarth?
Posted: February 9th, 2009, 11:34 pm
by RedLexus
Hi all , we are "freshening up" my fathers Fiat 131 AR Rally car , it has an ex works engine so we want to be sure its really done right . It's running high top pistons , that protrude approx 2-3mm above the deck , so the compression must be quite high , as the Combustion chamber looks to be the standard shape . The Cylinder head bolts are arranged like the 8v , except one has to remove the cam boxes to get at them . What would you suggest as a correct Torquing figure? Regards , Tristan .
Re: Suggested Head torque for a Fiat 131 Abarth?
Posted: February 10th, 2009, 8:03 am
by Guy Croft
Are they 10mm capscrews?
By the way - what was the outcome of the 'walking cambelt' issue?
GC
Re: Suggested Head torque for a Fiat 131 Abarth?
Posted: February 10th, 2009, 9:36 am
by RedLexus
10mm yes , but a Torx type rather than a Cap screw . The Cambelt: we fitted a standard exhaust cam pulley with a guide on one edge, and made a device with nylon rollers to prevent walking the other way .
Since We have found end float on the distributor/oil pump drive shaft .
Thanks Guy.
Re: Suggested Head torque for a Fiat 131 Abarth?
Posted: February 10th, 2009, 1:08 pm
by Guy Croft
OK - decent photo of actual bolts and the head gasket please.
asap!
G
(this is going somewhere BTW!)
Re: Suggested Head torque for a Fiat 131 Abarth?
Posted: February 10th, 2009, 1:12 pm
by RedLexus
Will do GC , by later this evening .
Re: Suggested Head torque for a Fiat 131 Abarth?
Posted: February 10th, 2009, 5:49 pm
by tmvolumex
Tristan / Guy,
I know on the forced induction Abarth 16 valve head applications (Lancia 037, Lancia Group B Montecarlo, Fiat Abarth 035?) that Abarth used 12mm bolts on the exhaust side and 10mm bolts on the intake side. Maybe even 12mm all the way around on some? Did they also do this on the normally aspirated engines (Fiat Abarth 131) or only the forced induction ones?
Thanks,
Tom
Re: Suggested Head torque for a Fiat 131 Abarth?
Posted: February 11th, 2009, 1:36 pm
by Guy Croft
Not to the best of my knowledge Tom, but thanks for the note.
G
(more on this in due course)
Re: Suggested Head torque for a Fiat 131 Abarth?
Posted: February 11th, 2009, 2:08 pm
by RedLexus
sorry about the delay GC , camera problems! Photos by tonight.
Re: Suggested Head torque for a Fiat 131 Abarth?
Posted: February 11th, 2009, 2:24 pm
by Guy Croft
If Pat is coming over, Tristan tell him to bring the old head gasket and your new bolts too, I can photo them here and sort out torque settings at GCRE.
G
Re: Suggested Head torque for a Fiat 131 Abarth?
Posted: February 11th, 2009, 3:39 pm
by volumetrico
Hi Tristan. Hope you are well.
On the 037 Stradale the bolts are quoted at 9KG-m and 11KG-m for 10 and 12mm bolts respectively.
I know when I was after this info the works cars were quoted differently, so maybe thats the case with Pats 131 too?
Melo
Re: Suggested Head torque for a Fiat 131 Abarth?
Posted: February 11th, 2009, 3:41 pm
by volumetrico
Tom, think the 10/ 12mm bolt configuration is 037 specific.
Maybe something to do with the added stress of having the supercharger on the go.
Melo
Re: Suggested Head torque for a Fiat 131 Abarth?
Posted: February 11th, 2009, 9:40 pm
by RedLexus
Re: Suggested Head torque for a Fiat 131 Abarth?
Posted: February 12th, 2009, 8:15 am
by Guy Croft
The pistons are Venolia, probably with an OE ring pack 1.5, 2, 4mm rings.
The bolts are Ribe type. We'll talk gaskets and bolts when Pat visits.
GC
Re: Suggested Head torque for a Fiat 131 Abarth?
Posted: February 12th, 2009, 10:01 am
by RedLexus
Not OE Rings GC , Top one is 0.95 , middle is 1.15 , and Oil ring is 2.7 . Typical that we'd end up with an oddball... sigh.
Re: Suggested Head torque for a Fiat 131 Abarth?
Posted: February 12th, 2009, 10:24 am
by Guy Croft
In new state those rings - 0.95, 1.15, 2.7mm
could well have been 1, 1.2, 2.8mm as new which is do-able, you better make sure I get the pistons to czech it out,
G
