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Old 10-26-2010, 08:35 PM   #1
phunky_monkey
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Question AMS Short blocks

Hi All,

I've lost comp in 4th Cylinder and am looking to order a new EJ25 short block.

I've narrowed my choice down to:

AMS 600hp unit
Rallispec SB
Cosworth

Here in OZ the AMS and Rallispec will cost me the same money, or near enough to, while the Cosworth is about 2k more. I've been in talks with Dave at Rallispec and am very impressed with his customer service. AMS and Cosworth both have distributors here which is a plus for them.

I'm having trouble finding any feedback on the AMS EJ25 blocks, and was wondering if anyone here runs one?

Cheers,

Dane
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Old 10-26-2010, 09:21 PM   #2
limitedblkwrx
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Ams as in automotorsport? If that's the case I would have to say the engine is probably good to go those guys at Ams know what there doing when it comes to going fast and having reliable products

My two cents
-Rob
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Old 10-26-2010, 09:34 PM   #3
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Sorry, should have been more specific. Yes I'm referring to automotorsport.

Thanks for your opinion. I'm impressed by their quality of work in other arenas, but haven't seen much Subaru specific feedback.
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Old 10-26-2010, 09:57 PM   #4
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Don't look at price look at what is being put into the block and how reputable the company is....all those companies are great, especially AMS...my block is built by RealStreet performance and they are top notch
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Old 10-26-2010, 10:19 PM   #5
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The Cosworth pistons are very appealing in the Rallispec block, and I've heard nothing but good things so am leaning that way at the moment. All companies listed seem very reputable, and products are not too distant in specs so consumer feedback is very important to me.
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Old 10-27-2010, 12:13 AM   #6
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RalliSpec block is awesome. I have used it in many cars.

Jr
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Old 10-27-2010, 12:18 AM   #7
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Thanks for the feedback JR. Never any dramas with it?
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Old 10-27-2010, 11:36 PM   #8
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I have personally never had a single issue with the RalliSpec block. I have tuned, installed well over 25 of them.
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Old 10-27-2010, 11:41 PM   #9
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Champion, exactly what I was hoping to hear
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Old 10-28-2010, 12:25 AM   #10
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In my opinion the AMS 600HP short block is overpriced.

I mean they use the same rods as Rallispec, same bearings, crank, block... but they used JE pistons (nothing wrong with that but they are not Cosworth!!!) and they charge you $4,300 Vs. $3,500 Rallispec (used to be $3,000). All because they built it... sorry, overpriced.

I know AMS is a great shop but for what I've seen so is the Rallispec (and they actually have a lot more experience building EJ motors). Get the Rallispec.
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Old 10-28-2010, 12:31 AM   #11
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Both engines are the same price for me here in OZ, but I tend to agree with you on the experience and reputation of Rallispec engines and the fact they use Cosworth pistons.
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Old 10-28-2010, 10:46 AM   #12
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Does the AMS block use a custom or off the shelf JE piston?...HUGE difference.
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Old 10-28-2010, 03:39 PM   #13
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search around for the rallispec....there are several on here running them with no issues. most pushing some very respectable hp numbers.
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Old 10-28-2010, 06:30 PM   #14
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Quote:
Originally Posted by Homemade WRX View Post
Does the AMS block use a custom or off the shelf JE piston?...HUGE difference.
What makes it such a big difference? I've not heard particularly bad things about JE's in other applications. Are the custom pistons of a different design/material composition?
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Old 10-28-2010, 06:34 PM   #15
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Billet and more expensive of course.
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Old 10-28-2010, 06:38 PM   #16
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Ahhh ok, thanks. I'll ask the question.
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Old 10-28-2010, 11:59 PM   #17
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Both JE and Cosworth copied the design from a British company called Omega (hence the "Omega-style" name), so they're pretty much going to be the same. I forget who Cosworth uses for their pistons, it might be Ross.

Most aftermarket pistons are forged and then milled out to shape. Pure billet pistons are pretty expensive.

Stroker engines should use the Omega-style pistons. Pistons with the normal skirt design end up hitting the counterweights on the crank.
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Old 10-29-2010, 12:16 AM   #18
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Quote:
Originally Posted by WillyT View Post
Both JE and Cosworth copied the design from a British company called Omega (hence the "Omega-style" name), so they're pretty much going to be the same. I forget who Cosworth uses for their pistons, it might be Ross.

Most aftermarket pistons are forged and then milled out to shape. Pure billet pistons are pretty expensive.

Stroker engines should use the Omega-style pistons. Pistons with the normal skirt design end up hitting the counterweights on the crank.
A "billet" piston is still a forging with 100% machined surfaces. Machining a piston out of bar stock would be worse than a standard forged piston from a material properties standpoint.
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Old 10-29-2010, 09:52 AM   #19
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Thanks for the compliments gentlemen, we have been developing our EJ motor program over the past few years and are quite happy with the results. Our most current offerings are two shortblocks, the 600HP built bottom end and the 900HP Darton sleeved bad-ass block . We have many 500+ and 600+ whp Subarus running these shortblocks with great results.

Quote:
Originally Posted by Homemade WRX View Post
Does the AMS block use a custom or off the shelf JE piston?...HUGE difference.
We use somewhat standard JE pistons. They are 8.5:1 compression ratio and we include the upgraded 1000whp rated JE wrist pins with our built motors.

-Ty
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Old 10-29-2010, 10:14 AM   #20
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Quote:
Originally Posted by MartinSTi05 View Post
A "billet" piston is still a forging with 100% machined surfaces. Machining a piston out of bar stock would be worse than a standard forged piston from a material properties standpoint.
I agree? A forged piston that's been machined to spec and a piston that's been made from a billet piece ought to be the same alloy.
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Old 10-29-2010, 11:48 AM   #21
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Quote:
Originally Posted by phunky_monkey View Post
What makes it such a big difference? I've not heard particularly bad things about JE's in other applications. Are the custom pistons of a different design/material composition?
You can get whatever you want done for the most part...ringland changes, custom crowns, ring packages, pin changes, etc...the list goes on and on, I know

For instance, my 4" pistons weigh less than JE's OTS 100mm pistons and have thicker ringlands, a higher compression ratio and a few other niceties built in...but they aren't cheap but much more affordable once you are direct with them (i.e. a builder who's spent $xxxx with them).

Quote:
Originally Posted by AMS View Post
We use somewhat standard JE pistons. They are 8.5:1 compression ratio and we include the upgraded 1000whp rated JE wrist pins with our built motors.

-Ty
ok, so the steel wrist pin instead of the basic nickle coated. I run the same material. Thanks for the response!

Last edited by Homemade WRX; 10-29-2010 at 11:54 AM.
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Old 11-05-2010, 02:18 AM   #22
phunky_monkey
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Thanks for all the feedback guys. After reading all the great reviews I've ordered a Rallispec block and will hopefully have it over here in OZ soon
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