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Fri Nov 04, 2022 7:21 am

Hello all,
anyone has any experience with Moresa pistons, specially this model?
https://www2.cip1.com/vwc-311-198-069-bmx/

thanks

Fri Nov 04, 2022 8:09 am

borna428 wrote: Hello all,
anyone has any experience with Moresa pistons, specially this model?
https://www2.cip1.com/vwc-311-198-069-bmx/

thanks

I will reply here, for all to read.

Yes, that's what I used from Moresa, which was used by VW of Mexico in the Mexican-made VW engines. I stated Grant rings, but could've been Hastings, but anyway for sure WERE made-in-USA rings. I see that CB has their kit for less than CIP1, and you could always call CB and ask which rings are supplied these days. Anyway, I'm still using those in my engine, and no issues. https://www.cbperformance.com/product-p/1000.htm

For EVERYTHING, there will be some who love the item and some will absolutely hate it. Like The Good, the Bad and the Ugly is my favorite film while others have Police Academy 27 as their favorite....

Fri Nov 04, 2022 8:51 am

Cusser wrote: borna428 wrote: Hello all,
anyone has any experience with Moresa pistons, specially this model?
https://www2.cip1.com/vwc-311-198-069-bmx/

thanks

I will reply here, for all to read.

Yes, that's what I used from Moresa, which was used by VW of Mexico in the Mexican-made VW engines. I stated Grant rings, but could've been Hastings, but anyway for sure WERE made-in-USA rings. I see that CB has their kit for less than CIP1, and you could always call CB and ask which rings are supplied these days. Anyway, I'm still using those in my engine, and no issues. https://www.cbperformance.com/product-p/1000.htm

For EVERYTHING, there will be some who love the item and some will absolutely hate it. Like The Good, the Bad and the Ugly is my favorite film while others have Police Academy 27 as their favorite....

Thanks for the info.
maybe is just the pictures, but the one I have is from CIP1 with Hastings rings and the pistons have short skirts just like the picture from CIP1. However the picture on CB shows longer skirt pistons and looks very different from the one from CIP1. Do you know if Moresa has 2 different versions of cylinder /piston kits? If so which is better?

Fri Nov 04, 2022 10:46 am

borna428 wrote: Cusser wrote: borna428 wrote: Hello all,
anyone has any experience with Moresa pistons, specially this model?
https://www2.cip1.com/vwc-311-198-069-bmx/

thanks

I will reply here, for all to read.

Yes, that's what I used from Moresa, which was used by VW of Mexico in the Mexican-made VW engines. I stated Grant rings, but could've been Hastings, but anyway for sure WERE made-in-USA rings. I see that CB has their kit for less than CIP1, and you could always call CB and ask which rings are supplied these days. Anyway, I'm still using those in my engine, and no issues. https://www.cbperformance.com/product-p/1000.htm

For EVERYTHING, there will be some who love the item and some will absolutely hate it. Like The Good, the Bad and the Ugly is my favorite film while others have Police Academy 27 as their favorite....

Thanks for the info.
maybe is just the pictures, but the one I have is from CIP1 with Hastings rings and the pistons have short skirts just like the picture from CIP1. However the picture on CB shows longer skirt pistons and looks very different from the one from CIP1. Do you know if Moresa has 2 different versions of cylinder /piston kits? If so which is better?

hahah, I guess I can answered my own question here. IT seems CB uses a general picture for all their piston/cylinder sets and doesn't matter what brand or size. :)

Sat Nov 05, 2022 4:23 pm

So nobody else used Moresa piston / cylinder kit?

Sat Nov 05, 2022 6:32 pm

As Cusser put it, they were the manufacturers of VW OEM in Mexico. Usually that is a pretty good sign but as time goes on manufacturer quality can lack.

You don't have very many choices for a piston cylinder set.

If you are looking for the best for with NOS K&S, Mahle, Nural, etc that are Made in Germany.

Sat Nov 05, 2022 8:23 pm

heimlich wrote: As Cusser put it, they were the manufacturers of VW OEM in Mexico. Usually that is a pretty good sign but as time goes on manufacturer quality can lack.

You don't have very many choices for a piston cylinder set.

If you are looking for the best for with NOS K&S, Mahle, Nural, etc that are Made in Germany.

Ok, i am using Moresa, therefore will do a complete review of how the set is

Sun Nov 06, 2022 7:13 am

Oh - by the way, my Moresa pistons, wrist pins were almost exactly the same in weight, way within the VW weight tolerance of +/- 5 grams.

Sun Nov 06, 2022 9:51 am

Cusser wrote: Oh - by the way, my Moresa pistons, wrist pins were almost exactly the same in weight, way within the VW weight tolerance of +/- 5 grams. :thumbsup: :thumbsup: :thumbsup:

Sun Nov 06, 2022 1:23 pm

borna428 wrote: ... will do a complete review ...
Good. Please be sure to report info regarding deck height, because it's said to be an issue with Moresa P&C's. For example, look here:

https://www.thesamba.com/vw/forum/viewtopic.php?p=9552221&highlight=preping+175#9552221

Sun Nov 06, 2022 1:43 pm

borna428 wrote: So nobody else used Moresa piston / cylinder kit?
I have the 85.5 Moresa's with grant rings currently. Nothing wrong with the hastings rings that came with it but just chose to use some grants I had. No ring gap adjustments were necessary. Cylinder bores were round as far as I could measure with a snap gauge and micrometer. Crosshatch was good. Just gave them a good cleaning. One piston was 3g more than the others so I took the weight off the inside of its wristpin. Skirt gap was on spec. I was able to get the deck height exactly the same on all four. I did shave the tops of the cylinders to get the DH to .055. I measured the piston height crown to top of the wristpin with a dial indicator and they came out same.
The casting and finish quality of the new Moresa pistons weren't the same quality as Cofap's or Mahle's from the 80's but functionally will probably perform and last just as long.

I follow John Connelly's ring and cam break-in procedure and run it hard up and down a steep and long 1/4 mile 15% grade. I checked compression at 1000 miles and IIRC it was ~130psi+ on each cylinder.

So far I'd say they're good quality and could recommend.

Mon Nov 07, 2022 7:26 am

frenchroast wrote: borna428 wrote: So nobody else used Moresa piston / cylinder kit?
I have the 85.5 Moresa's with grant rings currently. Nothing wrong with the hastings rings that came with it but just chose to use some grants I had. No ring gap adjustments were necessary. Cylinder bores were round as far as I could measure with a snap gauge and micrometer. Crosshatch was good. Just gave them a good cleaning. One piston was 3g more than the others so I took the weight off the inside of its wristpin. Skirt gap was on spec. I was able to get the deck height exactly the same on all four. I did shave the tops of the cylinders to get the DH to .055. I measured the piston height crown to top of the wristpin with a dial indicator and they came out same.
The casting and finish quality of the new Moresa pistons weren't the same quality as Cofap's or Mahle's from the 80's but functionally will probably perform and last just as long.

That is very good to know as well.
So I should weight each piston including rings, pin to make sure all within 3 grams of each other?

Also, when you said Crosshatch was good, meaning no need to hone the cylinder?

One last question, Is it necessary or good idea to lap the cylinders to heads with some lapping compound? If so what grit is good to start with? I have one that starts with 120 and goes to 220 grit, but I think that is too coarse?

Mon Nov 07, 2022 7:42 am

borna428 wrote:
So I should weight each piston including rings, pin to make sure all within 3 grams of each other?

I would and it's easy to get it to <.5 gram. I also balance the rods and weigh the whole assembly if you have the case apart. Not strictly necessary for a stock motor and once oil splashes around on it that balance will change but still, why not, IMO.

borna428 wrote:
Also, when you said Crosshatch was good, meaning no need to hone the cylinder?

Yes, I was just looking for consistency or flaws like if it got messed it up taking it off the honing tool or whatever they use at the factory. I have an old Mahle where with the original honing marks at the bottom of the cylinder that I use as a benchmark. IIRC, the angle was ~40°.

borna428 wrote:
One last question, Is it necessary or good idea to lap the cylinders to heads with some lapping compound? If so what grit is good to start with? I have one that starts with 120 and goes to 220 grit, but I think that is too coarse?

I do. I just use whatever I have in my box. It's the type that gets finer as you use it. Just give it a few turns and make sure it's even.

Mon Nov 07, 2022 9:51 am

borna428 wrote: So I should weight each piston including rings, pin to make sure all within 3 grams of each other?
And with the connecting rod too !

Mon Nov 07, 2022 9:53 am

Cusser wrote: borna428 wrote: So I should weight each piston including rings, pin to make sure all within 3 grams of each other?
And with the connecting rod too !

too late for connecting rods. I already closed the case :oops: :oops:

Mon Nov 07, 2022 3:49 pm

Rods can be installed and removed with case closed up.

Mon Nov 07, 2022 5:02 pm

borna428 wrote: Cusser wrote: borna428 wrote: So I should weight each piston including rings, pin to make sure all within 3 grams of each other?
And with the connecting rod too !

too late for connecting rods. I already closed the case :oops: :oops:

Typically a manufacturer will match up weights on the connecting rods, and on the pistons/wrist pins. I would sure hope so, in this day and age !!!

Since rods are installed already, I'd leave them be.