Problem: Ross piston fitment onto standard con rods??

[Nelo]

Hi,

Was putting my Ross 86mm pistons together today that I bought from GTSchris. Got the rings on and was dismantling my standard pistons and rods.

Pulled the first piston off its rod and went to put said rod into the Ross piston........... however I was shocked and really annoyed to find that they wouldn't bloody fit!! The rod is too wide to fit in between where the gudgeon pin goes....

I've never seen anybody mention this before, probably since they're not a very popular piston but are supposed to be good nonetheless.

So, solutions anybody? We have looked at possible getting the rod end machined to fit between the piston.

Or do I spend more money and get a set of Eagle rods..... What's to say I won't have the same problem with the eagle rods though?

Any and all advice appreciated as usual,

Thanks guys.
Pete

[stevecordiner]

Whaaatt??

Do you mean Ross pistons dont fit the standard conrods? I find that incredibly hard to believe since I've seen companies in the US selling a high performance engine kit (Which includes all gaskets, oil pump, bearings etc) and they dont add conrods to the mix.

[Nelo]

yup, getting photos this evening hopefully......... bit ridiculous. But thankfully GTSChris has kindly agreed to pay for any expense incurred machining either to fit.... so great customer service from Chris and i'd like to thank him for it.

Pics to follow..

Cheers
Pete

[lower]

i'd be inclined to machine the pistons, not the rods. the rods are the size they should be, its the pistons that are at fault.

stupid question, but are the pistons the correct ones for the engine? you've not accidently been supplied the wrong ones?

[MR2Mania]

i'd be inclined to machine the pistons, not the rods. the rods are the size they should be, its the pistons that are at fault.

stupid question, but are the pistons the correct ones for the engine? you've not accidently been supplied the wrong ones?

I'm inclined to agree that the rods shouldn't be machined. Whatever you decide to machine to resolve the problem, it's probably worth getting them rebalanced or their weights matched.

[Nelo]

i'd be inclined to machine the pistons, not the rods. the rods are the size they should be, its the pistons that are at fault.

stupid question, but are the pistons the correct ones for the engine? you've not accidently been supplied the wrong ones?

I checked the order no and they are the correct size bore and dimensions. On the ross site I checked the # 99814 and it confirmed same. It's just the rod pockets are too small.

I'm inclined to agree that the rods shouldn't be machined. Whatever you decide to machine to resolve the problem, it's probably worth getting them rebalanced or their weights matched.

Hmm, this is becoming interesting now, because on one hand you guys are telling me to machine the pistons and on the OC (Californiiaaaaa) they say to machine the rods!! Should I flip a coin

http://www.mr2oc.com/showthread.php?p=960211 for reference

[MR2Mania]

Hmm, this is becoming interesting now, because on one hand you guys are telling me to machine the pistons and on the OC (Californiiaaaaa) they say to machine the rods!! Should I flip a coin

http://www.mr2oc.com/showthread.php?p=960211 for reference

My thinking is, why compromise the strongest part of the engine to suit a piston that doesn't fit properly? After all, pistons are bordering on being "consumables". Yes, even forged pistons can blow!

[SIMON W]

had same problem with my je pistons 86mm you do have to machine rods and mine are eagle rods. egle rods are same size as standerd rods my car is running garret gt 35/42 at 2 bar and it is ok

[Paul R]

Hi,

This sounds daft. Surely if you machine either the rods or the pistons, you are going to throw one or the other off balance?

Isnt machining one to fit the other going to mess things up anyway? Surely the pistons are machined to suit the weight/size of the standard rods??

Paul.

[MR2Mania]

had same problem with my je pistons 86mm you do have to machine rods and mine are eagle rods. egle rods are same size as standerd rods my car is running garret gt 35/42 at 2 bar and it is ok

That's the first time that I've heard of someone using JEs and needed to machine the rods. Maybe it's because you've got aftermarket rods?

Can anyone else confirm that they've used JEs and not had to machine the rods?

[Nelo]

Ok got pics there tonight....

this is the cracked piston, not great quality really.....



Comparison between Standard and Ross rod pockets:



This shows how much the rod is too big by...........

[Paul R]

had same problem with my je pistons 86mm you do have to machine rods and mine are eagle rods. egle rods are same size as standerd rods my car is running garret gt 35/42 at 2 bar and it is ok

That's the first time that I've heard of someone using JEs and needed to machine the rods. Maybe it's because you've got aftermarket rods?

Can anyone else confirm that they've used JEs and not had to machine the rods?

Hi,

I fitted a set to my block a couple of weeks ago. They were a perfect fit for the standard rods.

Paul.

[Nelo]

Oh wait, look i've just realised that all I needed to use was this special SST to make the rod fit sorry.......







A pic of the car with its ass in the air looking a bit sorry for itself......



And finally one of my rims,

[CJ B]

I would contact Ross and explain, theres no way they would make them so different.
Perhaps it was a mix up at the factory and they ended up in the wrong box.
Dont machine anything until you have it confirmed.
Are you trying to fit them to the right engine?

Not Clarkey!

[MR2Mania]

Ok got pics there tonight....

Interesting!

Here's a pic of my stock rods side by side with the Pauter rods. The Pauter ones aren't the same size as stock because obviously I'm running a "long rod" conversion, but the head of the rod (gudgeon pin end) looks bigger on the Pauters if anything.

[CJ B]

Noticed you have your hood up, off to see a girl tonight? (without her seeing you of course)

[Nelo]

Yes, i'm bringing the hammer with me too clarkey. Just in case she tries anything clever, Mr Hammer will keep her from screaming MUAHAHAH....

[CJ B]

lol


Chris
(still not clarkey - does anyone know who this is??????)

[lower]

i'm with dino in my reasoning for machining the pistons. you know the rods are correctly sized because that is the size that toyota made them to. the original pistons had wider pockets that the rods fitted into, so all you are doing is matching the new pistons to the originals size.

definately machine the pistons.

i'd be inclined to machine the pistons, not the rods. the rods are the size they should be, its the pistons that are at fault.

stupid question, but are the pistons the correct ones for the engine? you've not accidently been supplied the wrong ones?

I checked the order no and they are the correct size bore and dimensions. On the ross site I checked the # 99814 and it confirmed same. It's just the rod pockets are too small.

I'm inclined to agree that the rods shouldn't be machined. Whatever you decide to machine to resolve the problem, it's probably worth getting them rebalanced or their weights matched.

Hmm, this is becoming interesting now, because on one hand you guys are telling me to machine the pistons and on the OC (Californiiaaaaa) they say to machine the rods!! Should I flip a coin

http://www.mr2oc.com/showthread.php?p=960211 for reference

[Goto10]

lol


Chris
(still not clarkey - does anyone know who this is??????)

Ignore Nelo - he has certain 'difficulties' socialising with people.