Choice of Pistons ROSS or JE

[jdub]

It's hard to say, but I'll bet he bored it without the main bearing caps torqued down to spec...the cylinder walls on a 7M are on the thin side anyway and can be distorted when you start torquing on it. Especially when you go to the larger oversize bore. Make sure he uses a torque plate and the timing belt tensioning pulley is torqued down to spec too.

 

[supraguy31]

So you are saying that when I go to get this block bored out to have the front cover on it already. Im going to have it Decked just to make sure and I know you need the cover when you have it decked but I wasnt for sure if it needed to be on when you have the Cylinders bored and Honed

 

[bigaaron]

Ross pistons are old school technology, unrefined, heavy ass pistons that don't take abuse well at all. I will never use or sell another set of Ross pistons again.

 

[spoolint78]

i never had a problem with them.

Unrefined? Not sure, but they work.
So why mess with something that works?


just my 2 cents

 

[IJ.]

Ross pistons are old school technology, unrefined, heavy ass pistons that don't take abuse well at all. I will never use or sell another set of Ross pistons again.

How do you figure that?
(In my experience they hold up really well to abuse due to their mass)

 

[supraguy31]

Ok, I knew that there was someone that would have a not so Positive comment about them which is fine but Please elaborate on why they are so bad. I see that you have Probe Pistons on your Site so what makes those any better than the ROSS pistons or is there a Piston that you recommend.

 

[bigaaron]

I have two sets of pistons with the crowns broken in the same place. Neither one was run super lean. I have already posted pics in the past showing how the Ross is an old 2 valve per cylinder casting that they use for the 7m. The Ross pins that come with the set are too weak for the weight of the piston also. A piston that heavy can cause standard pins to flex. I would use CP or JE or Probe or anything but Ross. I have also been warned by several machine shops that Ross makes a habbit of screwing up custom orders. This is not only my opinion, but also several other people I know who have been in the industry for a lot longer then myself. I try not to make claims that are not backed up by personal experience and research.

 

[WhtMa71]

Ive had good experiences with CP..IF you were buying new..id go that route. 2nd JE.

 

[IJ.]

I have two sets of pistons with the crowns broken in the same place. Neither one was run super lean. I have already posted pics in the past showing how the Ross is an old 2 valve per cylinder casting that they use for the 7m. The Ross pins that come with the set are too weak for the weight of the piston also. A piston that heavy can cause standard pins to flex. I would use CP or JE or Probe or anything but Ross. I have also been warned by several machine shops that Ross makes a habbit of screwing up custom orders. This is not only my opinion, but also several other people I know who have been in the industry for a lot longer then myself. I would never make claims that are not backed up by personal experience and research.

Got pics of the failed pistons?

 

[Doward]

Arias pistons ftw. (Having now seen them @ Bryan Maloof's shop)

 

[bigaaron]

I forgot Arias, I have those in my 7m, they seemed to be very nice, but they did cost over $1k with the custom order.

 

[jonny87turbo]

I will be rebuilding my engine sometime ive never heard of probe pistons before till a couple months ago. Would those pistons be a good buy?
Or should i just spend the extra $350 on the JE.

 

[jdub]

How do you figure that?
(In my experience they hold up really well to abuse due to their mass)

:withstupi



Haven't seen a Ross piston fail, unless it was due to the installer or it was run lean and melted the top.

I will be rebuilding my engine sometime ive never heard of probe pistons before till a couple months ago. Would those pistons be a good buy?
Or should i just spend the extra $350 on the JE.

Have a look at CP pistons...Suprarich stocks them. JE's would be my 2nd choice.

 

[MRSUPRA]

My Arias pistons only cost about $550. The shop that built my 7M which deals with all kinds of forged pistons recomended them because of there tight tolerances. (Maybe they have a special deal with Aria, who knows?).

Ross pistons are heavy and I have heard of them having piston slap when cold.

 

[Doward]

If you can spring for them, the Arias are super nice (AND CONTOURED TO THE HEAD)

If not, the Probe pistons were 90% of the Arias @ 1/2 the cost, lol

*edit* $550 for Arias? That's a steal. When I was looking into a set of pistons before the Probe GB, I was quoted $735 for a set.

 

[MRSUPRA]

/\The shop price was $1000 for Eagle rods and Arias pistons together, so I'm just guestimating on the $550 price.

 

[Rennat]

Ross - 357 Grams
Arias - 312 Grams

According to 935motorsports....
And there the only vendor site i could find that listed piston weights... weird...

Probe - 300 Grams AND there on sale for $395 at Driftmotion! DM FTW!!!!

My point is if your going solely off of weight... the probe are the "best"...

 

[starscream5000]

... For racing possibly.

 

[92nsx]

I have used Ross in the past (2001) on one of my 7m builds. Dont know if was the pistons, rings, or the install, But i had a slight tick at first start up. Other then that, they were great, held up to boost i was running at the time, (15-17 psi). How ever this time around i am going with JE 40 over pistons, just because i got a great deal on them, and i wanted to try them out.