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bcrazy
Samba Member
Joined: October 24, 2009
Posts: 239
Location: Oslo
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 Posted: Mon Jun 30, 2025 2:10 pm Post subject: "Special" thick wall slip in 88 (both ends) |
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Came a cross a used set of 88mm slip in P&C
These seems to be thicker than the normal slip ins i have seen before.
If they have been machined down at the head register or designed that way i do not know.
Anyone have some info or seen these before
There is an old post on this forum about "VICSA" piston and cylinders.
Maybe this is what was used in the OEM Brasil 1679cc engines??
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modok
Samba Member
Joined: October 30, 2009
Posts: 27674
Location: Colorado Springs
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| Posted: Mon Jun 30, 2025 6:37 pm Post subject: Re: "Special" thick wall slip in 88 (both ends) |
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Looks like regular old slip in 88's to me
I've seen that U shape logo a thousand times before but for some reason I can't remember what it means
Do they use 1.5mm rings? |
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67rustavenger
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Joined: February 24, 2015
Posts: 11099
Location: Oregon
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| Posted: Mon Jun 30, 2025 9:12 pm Post subject: Re: "Special" thick wall slip in 88 (both ends) |
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| modok wrote: |
Looks like regular old slip in 88's to me
I've seen that U shape logo a thousand times before but for some reason I can't remember what it means
Do they use 1.5mm rings? |
Isn't that a Mahle stamping?
_________________
I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo!
2003 Astrovan? GFYS again, Xevin! 
Don't let your bad ideas remain, ideas! |
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modok
Samba Member
Joined: October 30, 2009
Posts: 27674
Location: Colorado Springs
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| Posted: Mon Jun 30, 2025 9:17 pm Post subject: Re: "Special" thick wall slip in 88 (both ends) |
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| probably, just can't remember, caught me on a bad day.. |
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modok
Samba Member
Joined: October 30, 2009
Posts: 27674
Location: Colorado Springs
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| Posted: Mon Jun 30, 2025 9:20 pm Post subject: Re: "Special" thick wall slip in 88 (both ends) |
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| AHA! it's METAL LEVE |
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67rustavenger
Samba Member
Joined: February 24, 2015
Posts: 11099
Location: Oregon
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| Posted: Mon Jun 30, 2025 10:13 pm Post subject: Re: "Special" thick wall slip in 88 (both ends) |
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| modok wrote: |
| AHA! it's METAL LEVE |
_________________
I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo!
2003 Astrovan? GFYS again, Xevin!
Don't let your bad ideas remain, ideas! |
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bcrazy
Samba Member
Joined: October 24, 2009
Posts: 239
Location: Oslo
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| Posted: Mon Jun 30, 2025 11:48 pm Post subject: Re: "Special" thick wall slip in 88 (both ends) |
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Rings are 2,3 and 5mm
Someone got a set of 88slip in to compare? |
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modok
Samba Member
Joined: October 30, 2009
Posts: 27674
Location: Colorado Springs
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| Posted: Tue Jul 01, 2025 12:55 am Post subject: Re: "Special" thick wall slip in 88 (both ends) |
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I see
The cima/mahle 88 had 1.5-1.5-5 ring pack |
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DesertSasquatchXploration
Samba Member
Joined: April 16, 2021
Posts: 972
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| Posted: Tue Jul 01, 2025 9:22 am Post subject: Re: "Special" thick wall slip in 88 (both ends) |
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What's the deal with 1.5 and 2mm rings? Are the 2mm supposed to last longer?
_________________
Key is to have downward travel Preload keep both wheels on the ground at all times once you lift a tire your DONE. Guys worry about clearance instead think of the opposite you want the suspension to drop that tire in the hole and keep you going. A spider for example they keep their body low but their legs can reach pretty far so they don't (bottom out) |
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chrisflstf
Samba Member
Joined: February 10, 2004
Posts: 4057
Location: San Diego
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| Posted: Tue Jul 01, 2025 10:02 am Post subject: Re: "Special" thick wall slip in 88 (both ends) |
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| Thinner rings mean less drag |
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vwracerdave
Samba Member
Joined: November 11, 2004
Posts: 15600
Location: Deep in the 405
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| Posted: Tue Jul 01, 2025 10:16 am Post subject: Re: "Special" thick wall slip in 88 (both ends) |
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Those are cast pistons. See the 2 metal tabs between the wrist pin bosses.
_________________
2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK |
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bcrazy
Samba Member
Joined: October 24, 2009
Posts: 239
Location: Oslo
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| Posted: Tue Jul 01, 2025 1:43 pm Post subject: Re: "Special" thick wall slip in 88 (both ends) |
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| If someone has a 88mm slip in cylinder on the shelf, and could measure the thickness at the fin area, that would be great |
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DesertSasquatchXploration
Samba Member
Joined: April 16, 2021
Posts: 972
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| Posted: Tue Jul 01, 2025 1:57 pm Post subject: Re: "Special" thick wall slip in 88 (both ends) |
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| chrisflstf wrote: |
| Thinner rings mean less drag |
WOW
Talking ACVW, I would assume fatter rings will take longer to seize with carbon because of bigger holes. With the modern oils the fatter rings are outdated? But we still run hotter then water-cooled and more fuel. Even with that, the new oils can overcome this?
In short are 1.5mm top and middle rings the new base line Normal?
_________________
Key is to have downward travel Preload keep both wheels on the ground at all times once you lift a tire your DONE. Guys worry about clearance instead think of the opposite you want the suspension to drop that tire in the hole and keep you going. A spider for example they keep their body low but their legs can reach pretty far so they don't (bottom out) |
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Wreck
Samba Member
Joined: July 19, 2014
Posts: 1314
Location: Brisbane
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| Posted: Tue Jul 01, 2025 3:00 pm Post subject: Re: "Special" thick wall slip in 88 (both ends) |
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The machine in AA's I have are not machined centred to the area you are talking about . varies from 9.5mm to about 7mm .
On the topic of pistons and rings , Toyota V6 + 0.020" are 87.95mm with a 1.2, 1.2, 3mm ring pack and pin height of 31.25 (from memory). So a 78mm crank and 5.5" rods get you in the ball park .
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VWporscheGT3
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Joined: September 01, 2006
Posts: 2179
Location: Gardnerville, NV
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| Posted: Wed Jul 02, 2025 6:15 am Post subject: Re: "Special" thick wall slip in 88 (both ends) |
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| DesertSasquatchXploration wrote: |
| chrisflstf wrote: |
| Thinner rings mean less drag |
WOW
Talking ACVW, I would assume fatter rings will take longer to seize with carbon because of bigger holes. With the modern oils the fatter rings are outdated? But we still run hotter then water-cooled and more fuel. Even with that, the new oils can overcome this?
In short are 1.5mm top and middle rings the new base line Normal? |
1.5 top rings have been std for a long time , the American equivalent is 1/16. 2 mm is closer to 5/64.
when it comes to fatter rings it was mainly due to materials being used. modern rings are steel instead of a cast material , they are stronger and less material can be used for the same strength. Modern oils can come in to play , but its far less than you think. service interval and tune come into play.
GM LS engines would be a prime example of this, take your average 5.3L truck motor. typically those had a 1.2 1.2 2.8mm ring pack. while this created less drag it doesnt count for much if your service intervals are 6k and 8k. the oil tends to sludge and then start packing in the oil ring causing more oil consumption and smoking. Ford eco boost's are even worse at this. just because the manufacturer is recommending 6k 8k oil changes doesnt mean that the oil necessarily can handle that.
one of the benefits of the newer materials like steel in rings , as well as going thinner, is that they are more compliant to the cylinder surface. and as we know VW cylinders never stay straight. compliance to the surface obviously means better sealing over a longer period of time than a thicker ring.
i hope this helps.
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bcrazy
Samba Member
Joined: October 24, 2009
Posts: 239
Location: Oslo
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| Posted: Thu Jul 03, 2025 12:55 pm Post subject: Re: "Special" thick wall slip in 88 (both ends) |
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Got hold of another set of 88mm. No markings to suggest what brand.
The wall thickness of this set is about 0.6mm less than the one from Brasil
This suggest there might be some different spec 88mm slip in variants.
Would be interesting to see what wall thickness in the fin area 85.5mm cylinders have.
"ino brasil"
Uknown
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NJ John
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Location: HdG, MD & NJ
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