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 92.3mm Pinto pistons
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Krister K
Starting Member

Sweden
36 Posts

Posted - 25 Sep 2014 :  18:57:22 Show Profile Reply with Quote
Hi!
I just bought a set of 92.3mm (1.5mm oversize) Pinto pistons for my v4, and I was curious if anyone here is using these pistons? If so; What headgaskets do you use? Any machining on top of pistons?

Thanks!

Saab 96 v4 '75b

Woody
V4 Guru

United Kingdom
2413 Posts

Posted - 25 Sep 2014 :  23:32:33 Show Profile Reply with Quote
Hej, Welcome to the Forum.

Production bore was 90mm so 92.3mm is more than 1.5mm oversize for a V4 though the Pinto was 90.8 standard?. I suspect these will be for use with a 1700 crank as they will have a different compression height. Have some Pinto 2000 pistons but dont have a 1700 crank anymore so haven't used them yet.
I believe there a some guys on here who have/are using them so maybe they will come on shortly.
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Krister K
Starting Member

Sweden
36 Posts

Posted - 26 Sep 2014 :  16:06:54 Show Profile Reply with Quote
Hi Woody!

Yes, its 1.5mm oversize in the Pinto engine, 2.3mm oversize in the v4.
I will be using a 1700 crank, and the discplacement will be around 1788cc with 92.3mm pistons if my calculation is correct.
Vroom vroom!

Saab 96 v4 '75b
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TTruckie
V4 Fanatic

United Kingdom
286 Posts

Posted - 26 Sep 2014 :  21:50:37 Show Profile Reply with Quote
I've got 90.8mm pinto pistons with a 1700 crank and they didn't need any machining (the block had been milled).

There is a couple of threats about the rebuild that may be of interest.

good luck and indeed VROOM VROOM!
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Krister K
Starting Member

Sweden
36 Posts

Posted - 27 Sep 2014 :  08:31:20 Show Profile Reply with Quote
Do you use std head gaskets with the 90.8mm pistons..?

This is my car btw:




Saab 96 v4 '75b
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Woody
V4 Guru

United Kingdom
2413 Posts

Posted - 27 Sep 2014 :  12:56:49 Show Profile Reply with Quote
Nice looking V4 Krister. Love to see V4s with Bosch Knicks mounted. How have you mounted them to the bumper?
Std head gaskets are fine for 90.8 but 92.3 will require something different I would guess. My V4 has 91mm pistons but I am using comp gaskets with separate copper ring inserts. I don't know what the availability is of the 93mm comp gaskets and rings.

Brings back memories of my first V4, taken 40yrs ago..


Edited by - Woody on 27 Sep 2014 13:08:08
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melle
V4 Guru

United Kingdom
2539 Posts

Posted - 27 Sep 2014 :  14:01:31 Show Profile Visit melle's Homepage Reply with Quote
I can send you a CAD file to have copper gaskets cut. Also see here: http://www.saab-v4.co.uk/speedball/topic.asp?topic_id=3621&whichpage=2

1970 96V4 "The Devil's Own V4"
1977 95V4 van conversion project
1988 900i 8V
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TTruckie
V4 Fanatic

United Kingdom
286 Posts

Posted - 27 Sep 2014 :  21:06:32 Show Profile Reply with Quote
I use the standard 90mm gaskets with the 90.8mm pinto pistons. As they come up flush there are no snags so far!
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72sonett3
V4 Fanatic

Spain
234 Posts

Posted - 29 Sep 2014 :  18:57:10 Show Profile Reply with Quote
I have some of those copper gaskets available, already made (including copper exhaust gaskets).



--
'72 97
'77 96L conv.
'79 96GL (LPG)
'83 900i (LPG)
'95 900SE conv.
'99 9-3T

Edited by - 72sonett3 on 02 Oct 2014 23:32:36
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dansp1
Starting Member

49 Posts

Posted - 29 Sep 2014 :  19:40:24 Show Profile Reply with Quote
what sealant (if any) do you use with the copper head gaskets?
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72sonett3
V4 Fanatic

Spain
234 Posts

Posted - 29 Sep 2014 :  20:20:07 Show Profile Reply with Quote
None. Never use any sealant with head gaskets.
Red copper head gaskets are soft enough to compress and seal, and are reusable.

--
'72 97
'77 96L conv.
'79 96GL (LPG)
'83 900i (LPG)
'95 900SE conv.
'99 9-3T
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Krister K
Starting Member

Sweden
36 Posts

Posted - 03 Oct 2014 :  06:27:21 Show Profile Reply with Quote
Thanks for your replies!
Anyone tried Sweedspeed's head gaskets? Haven't checked with them myself, but I heard that they have "std type" head gaskets for 90/91/92/93/94mm bore...

Saab 96 v4 '75b
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Krister K
Starting Member

Sweden
36 Posts

Posted - 03 Oct 2014 :  10:30:13 Show Profile Reply with Quote
I just got a reply from Sweedspeed; They have headgaskets for 94mm bore. According to them it will work just fine with my 92.3mm bore. Price is 2x49.50 euro excl vat. if any of you was wondering...

Saab 96 v4 '75b
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melle
V4 Guru

United Kingdom
2539 Posts

Posted - 03 Oct 2014 :  10:52:13 Show Profile Visit melle's Homepage Reply with Quote
Re copper gaskets and the use of sealants: http://www.aera.org/engine-professional/copper-head-gaskets/
Also see here: http://www.saab-v4.co.uk/speedball/topic.asp?TOPIC_ID=3621

1970 96V4 "The Devil's Own V4"
1977 95V4 van conversion project
1988 900i 8V
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dansp1
Starting Member

49 Posts

Posted - 03 Oct 2014 :  18:44:21 Show Profile Reply with Quote
Thanks for those links, i had read them before, what i really want are peoples personal experience with copper gaskets
i have a solid (alloy) gasket for my two stroke, the head and block will both be skimmed for as pefect a surface as possible but Niklas suggests using a gm sealant similar to hylomar and lots of the american sites advocate the use of spray copper instant gasket.
I appreciate that use of sealant should be very sparing but i tend to think some sealant is needed...
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melle
V4 Guru

United Kingdom
2539 Posts

Posted - 03 Oct 2014 :  18:56:23 Show Profile Visit melle's Homepage Reply with Quote
I haven't used the copper gaskets yet myself, but I would say the same regarding sealant; spray copper or Hylomar, applied in a very thin layer. I was given the tip to let it dry until it's barely tacky before installation.

1970 96V4 "The Devil's Own V4"
1977 95V4 van conversion project
1988 900i 8V
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