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FRM compatible forged pistons?

 
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Old 06-09-2011, 09:45 PM
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FRM compatible forged pistons?

I know this topic has been beaten to death, but i've gotten a bit confused. You see, some places say that there are places that stock a frm compatible forged piston that won't require resleeving, others say it does require re sleeving. Yes/no?


Thanks in advance, sorry for any "stupid" questions.
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Old 06-09-2011, 09:53 PM
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Re: FRM compatible forged pistons?

Mahle Gold Series Pistons.
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Old 06-09-2011, 10:28 PM
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Re: FRM compatible forged pistons?

i also beleive there is one other brand... maybe wiseco? not sure. but i wouldnt even shake a stick at em. all it is is a coating, if i remember correctly, that doesnt last very long. by long i mean 50000 miles. i wouldnt bother with them, as youll just end up sleeving in the end.
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Old 06-09-2011, 11:23 PM
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Re: FRM compatible forged pistons?

The only pistons you can use without resleeving are oem type s pistons, mahle pistons as stated by keegan, and certain types of jun pistons. The jun pistons are very very expensive. You wont see many ppl at all running them. Im not sure which ones you can use, Ive never researched them. But those are the only types of pistons you can run without resleeving.

Ive heard mixed reviews of the mahle pistons, you can read up on them and decide for yourself if they would be right for your build.
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Old 06-10-2011, 01:49 AM
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Re: FRM compatible forged pistons?

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Originally Posted by blackbb6 View Post
The only pistons you can use without resleeving are oem type s pistons, mahle pistons as stated by keegan, and certain types of jun pistons. The jun pistons are very very expensive. You wont see many ppl at all running them. Im not sure which ones you can use, Ive never researched them. But those are the only types of pistons you can run without resleeving.

Ive heard mixed reviews of the mahle pistons, you can read up on them and decide for yourself if they would be right for your build.
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Old 06-10-2011, 01:39 PM
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Re: FRM compatible forged pistons?

I've actually just emailed Mahle about their pistons and they are about $470 for a set and i was asking about high compression pistons, and they are 11:1. i was disappointed by them not having anything higher cause thats still pretty close to stock..
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Old 06-10-2011, 03:30 PM
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Re: FRM compatible forged pistons?

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Originally Posted by bCoy View Post
I've actually just emailed Mahle about their pistons and they are about $470 for a set and i was asking about high compression pistons, and they are 11:1. i was disappointed by them not having anything higher cause thats still pretty close to stock..
Well 11:1 is a pretty good compression, anything much over 12:1 and you are going to be using racing gas. But since they only have up to 11:1 I would just go with type-s pistons if I were you, I got mine for $245 shipped
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Old 06-10-2011, 05:33 PM
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Re: FRM compatible forged pistons?

i would definately opt for type s
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Old 06-11-2011, 07:31 PM
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Re: FRM compatible forged pistons?

A few more questions:

If i did go for sleeving, and wished for around 6 psi forced induction, how much would a set of forged pistons set me back?

Sleeving= 1200$ approx + ?


Type S pistons: How much would a mechanic install these for?
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Old 06-11-2011, 08:54 PM
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Re: FRM compatible forged pistons?

Quote:
Originally Posted by Blazingangel View Post
A few more questions:

If i did go for sleeving, and wished for around 6 psi forced induction, how much would a set of forged pistons set me back?

Sleeving= 1200$ approx + ?


Type S pistons: How much would a mechanic install these for?
Well man there is a lot you are not factoring in here, you are going to need new piston rings, new bearings, and resurface the head and block, new head gasket, lots of new o-rings, and gaskets, and seals, a rebuild including sleeving will run you $4,000+ do not sleeve your block and only go for 6 psi (unless you are going for high compression and boost?) you can boost the block 6psi pretty easily without a rebuild.

If you sleeve the block do not put in type-s pistons, get a nice set of forged pistons. Plus I am pretty sure you want some low compression pistons not 11:1 compression pistons.
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Old 06-11-2011, 10:20 PM
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Re: FRM compatible forged pistons?

Thanks for the information man :)


On stock internals, low low boost is feasible correct? But not reccomended :)

(BTW i don't even have a lude yet, im learning)
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Old 06-11-2011, 10:24 PM
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Re: FRM compatible forged pistons?

I don't know what you mean by recommended, I would recommend that you do not spend around $6,000 plus to run low boost on a motor. On a healthy motor you can easily run 6psi with a good tune (notice the key words, healthy and good tune).
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Old 06-11-2011, 10:46 PM
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Re: FRM compatible forged pistons?

Don't worry, i'm not going to go buy a random prelude and bolt on a supercharger without getting proper maintenance/ tune/ parts/ sleeves/etc.

On another note, how much do you think it'd cost on average to have the pistons changed in a shop? I've never had that done. I know more than "just" the pistons will have to be changed though
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Old 06-11-2011, 10:57 PM
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Re: FRM compatible forged pistons?

Well if a shop does it for you they would have to do at least all of this:

Take apart long block
Replace rings, bearings, head gasket etc.
Resurface head and block
Hone (most likely)
Put long block back together

So I would say at least $1,500-2,000+ for labor and parts depending on what shop does it/where you live.
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Old 06-12-2011, 03:17 PM
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Re: FRM compatible forged pistons?

2k sounds about right...id also do some head work if possible while its off. better valve train. if your gonna cam it later on your gonna need to do that.

also..manual tensioner conversion
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Old 06-12-2011, 03:30 PM
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Re: FRM compatible forged pistons?

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2k sounds about right...id also do some head work if possible while its off. better valve train. if your gonna cam it later on your gonna need to do that.

also..manual tensioner conversion
Yeah a valve job was $290 for me, then I spend right around $700 on a complete s2 valve train so plan on another grand if you want to build up your head also.
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Old 06-12-2011, 03:36 PM
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Re: FRM compatible forged pistons?

@keeganhmorgan that sounds about right. thats about what my valve job 3 angle ftw was parts were less cuz i used brian crower and stainless steel retainers tho.

u also gotta do the manual tensioner conversion if you use stiffer valve springs. otherwise the auto tensioner will fail after a few days even if its new.

iirc its like 2-300 for the parts.
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Old 06-12-2011, 03:48 PM
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Re: FRM compatible forged pistons?

Honestly - I would never change out pistons without a hone. The cross-hatching is very important when the piston rings have to match up to it.

My .02$ would be to call around to shops and get quotes and see what you are told. A lot of shop will talk themselves up because they want/need the work - dont be fooled. A shops reputation is earned, not made up.

Take your time too. If you dont have the car yet, build a budget for the car, engine, suspension, etc. The most important thing you can do when doing a build is RESEARCH! Leave no stone unturned and no idea forgotten.

Also - look into other models. If you log onto honda-tech.com you will notice a HUGE dif. in posts/threads when you compare the Prelude to a Civic or Integra. There are several reasons for this. The Prelude has a huge lack of aftermarket support compared to the above. Parts are harder to find and most cost more.

I dont see an issue with running a 10:1 c/r with about 10-12lbs of boost on a sleeved H22 (with the supporting hardware). Granted you have a good tuner do the computer work and not some kid down the street.
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Old 06-12-2011, 04:23 PM
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Re: FRM compatible forged pistons?

switch out the h for an f series block and drop in forged pistons. no need to sleeve the f block. but...you could run it at 5 psi and up the fuel pressure a little and be just fine with everything basically stock. if you gotta have the h + forged pistons i suggest grabbing some torque specs online and doing it yourself. you'll be more satisfied with it if you do it yourself.

and frm=sucks bad. get your motor a bit hot and your piston walls will look like they have dragstips on them.
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Old 06-19-2011, 11:39 PM
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Re: FRM compatible forged pistons?

You can also run OEM PDE (Accord Type R and possibly late model EUDM Preludes) pistons. Don't think they are compatible with stock rods though, unlike the P5P (Type S/Euro-R) pistons. Seen photos though and they do look lighter, I would imagine that the rods are also better.
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Old 08-19-2011, 01:12 AM
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Re: FRM compatible forged pistons?

mahle gold series pistons ok to drop in for boost in h22>?>
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Old 08-19-2011, 01:33 AM
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Re: FRM compatible forged pistons?

To help out anyone with questions about the "DROP IN" piston option. Mahle, Jun, & OEM. Thats it. Now as far as the mahle's are concerned they state that the 10cc pistons will give you "11.5:1" compression. Not true. They have the set for 90mm stroke also. When in actuality the h22 has 90.7. So you put in the 11.5's and you'll end up with 12.2:1. Anything under 12.5:1 can be ran on pump gas. Some nice bolt ons to compliment the compression and a great tune and you could have some fun. Also the low comp pistons are great for boost.
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