Chrysler rear main seals

[Charger4404spd]

Just seen this on Power Nation Engine Power Show. They were building a 225 and mentioned this rear main seal so I looked it up. Anyone used these yet? Looks like it would take care of a pesky seal leak. At that price it better.

http://www.fastfishautoparts.com/Performance-Engine-Seals.html

[fy469rtse]

No better than whats out there,
you have to cut it to get it on , ? how else do you get it over rear flange ( trans or flywheel mounting bolted flange )
now , look up i think Viton seals , Mancini has them .
oversize to correct the off centre line problem with rear caps

[Charger4404spd]

Yes, you have to cut them. Might be a little better considering you have one parting line instead of two with a 2 piece seal. And this one is double lipped. Just curious if anyone has used one.

[fy469rtse]

I like the viton because it also has side cap seals ,
Instead of the factory cardboard slides, another notoriously known area to leak ,

[b5blue]

84.95 shipped? 

[fy469rtse]

Just another seal ,
I compared the way it look compared the stock replacement one now included gasket kits, remember no more rope seals,
The same ? So one less cut joint , it's not these areas when compressed against each other that is normally a source of leak ,

[Cooter]

 

Just another seal ,
I compared the way it look compared the stock replacement one now included gasket kits, remember no more rope seals,
The same ? So one less cut joint , it's not these areas when compressed against each other that is normally a source of leak ,

[Charger4404spd]

Thanks thats good to know. Geezzz $85 for a dang seal.

[fy469rtse]

Spend the money on the Viton seal and oring sliders , it's an oversize to compensate for the cranks being off centre ,
Have to redo mine, as it was way off, and machining could only help correct it so much
And drips just enough to be %#€$ing annoying, motors coming out shortly , doing a few mods to help oil gear drive and bronze gear ,
Also much larger lift cam going back in

[Brass]

Is this the one?

http://www.manciniracing.com/subheviremas.html

[fy469rtse]

Yep that's the one ,
Bit better price than that other one , this works well

[fastfishautoparts.com]

A lot of effort, time, and money went into the design, tooling, and production of these one piece seals. They are well thought, proven design. Many have been sold, and used, especially in drag race engines. They are not just another seal. From a materials, dimensions, and sealing ability it is a better choice than a two piece seal. If you have questions please ask the people who designed it.  Contact information available at www.fastfishautoparts.com

Thank you

Jeff Guenther /   Fast Fish Auto Parts

[fy469rtse]

When mancini racing or guys on hear like challenger340 or Ron start start recommending them ,
I will consider these , but unfortunately I haven't heard of these until someone posted on here
It's a lot of work to tear down to get to replace seals if they don't work
I would love to see some one engineer completely something new ,
A new type of seal cap

[fy469rtse]

I was hoping a few of the engine guys on hear would have replied by now ,
But looks like there not familiar with them either 

[Challenger340]

In my experience only.... the problem with BB Mopar rear main seal leaks is NOT the Seal used..... it is the crank offset from the Seal "recess" in the Block, which if not adjusted for during assembly will leak.
I think I covered all this in a thread before ? maybe I should do another with pictures to SHOW what I am talking about ? because it vary's from Block to Block.

just sayín....
as long as anyone looks for... and adjusts for it during assembly ? even the cheapest Rear Main Seal will seal just fine.
We still assemble 12-15 BB Mopars a year, DYNO them all before the Customers take them, and we have NEVER had a main leak using just the cheapest stock Retainers and Main Seals.
I don't care what "main seal" you use.... IMO, if you don't pay attention to... and "correct" for the offset ? I believe it may potentially leak.

that said,
the "one cut" seal shown does offer the advantage placing the Seal on the Crank for easier assembly in the Block.... but IMO, you should still identify the offending offset side of the seal recess in the Block before final assembly, so that the Retainer can be adjusted before tightening to push the loose side into contact, even on the one piece seal ?  

[fastfishautoparts.com]

  I believe your statements to be true. Having said that the one piece single split design is not your typical molded synthetic rubber, that are hard. The one piece single split, is made of  softer more flexible material. This along with its dimensions will compensate to a greater degree, for retainer miss alignment, than the traditional two piece. It has two sealing lips, (versus one) has one parting line, and is relatively easy to install. It is a better choice than a two piece.

Fast Fish Auto Parts

[cdr]

i am in the process of a 512 build right now, i am going to order one of these seals & try it.

[fy469rtse]

Yep I know exactely what your talking about challenger340,
After line hone seal cap was measured and checked to see how much it was out ,
Went to the trouble of getting un machined cap,
Machined it to suit the off set , or as close as I could get
Could get it closer this way but still not perfect,
Viton and slides, I think where I went wrong was I had a high pressure pump initially on it , caused me issues with bronze gear , oil pressure was way too high,
Stock blueprinted pump on it now , and seal has settled, but still the odd drip,