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Author Topic:   351c piston ??
DRAGSTANG351
Journeyman

Posts: 67
From: FLORIDA
Registered: Dec 2001

posted 03-16-2002 08:38 AM     Click Here to See the Profile for DRAGSTANG351   Click Here to Email DRAGSTANG351     Edit/Delete Message   Reply w/Quote
i have just pulled the heads off my 351c
the guy who built the motor told me they
are trw flat top 10.7-1 pistons but i can't find know info about them anywhere, i would
like to find out what they really are?
351c 4v closed chamber (2298P .030)
i would like to find out what the correct comp ratio would be and if they are even made by trw

thanks
kelly

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Hemikiller
Gearhead

Posts: 667
From: Killingworth, CT
Registered: Feb 2002

posted 03-16-2002 03:01 PM     Click Here to See the Profile for Hemikiller   Click Here to Email Hemikiller     Edit/Delete Message   Reply w/Quote
These are a Sealed Power piston, same as the TRW Forged L2379F, with a compression distance of 1.650" Should yield 10.25 to 10.7 depending on deck height, head gasket, etc.

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DRAGSTANG351
Journeyman

Posts: 67
From: FLORIDA
Registered: Dec 2001

posted 03-16-2002 07:11 PM     Click Here to See the Profile for DRAGSTANG351   Click Here to Email DRAGSTANG351     Edit/Delete Message   Reply w/Quote
what piston should i go with for my drag car
the block is freshly bored .030 and the motor has been run maybe 10 hrs tops since rebuild my plans of a street and strip have gone out the window, i want this car to be a drag car only and i need advice on what pistons to buy? i want it to run strong on the motor and still be able to spray the juice 175 hp shot
when i need it, what type piston would you guy's suggest i get and what comp ratio? i was thinking 12-1 ratio would be good or a little higher maybe, i want to pump this thing up and still handle the juice.

thanks
kelly

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Fordwiser
Gearhead

Posts: 442
From: Metamora, Illinois
Registered: Dec 2000

posted 03-17-2002 12:25 PM     Click Here to See the Profile for Fordwiser   Click Here to Email Fordwiser     Edit/Delete Message   Reply w/Quote
The TRW L2348F is a domed piston for c/c heads, it's not real expensive and will take a lot of punishment (tough) but it is pretty heavy. There are several race piston manufactures JE/SRP,Aries,Wiseco,ect all of which should have lighter pistons and shorter lighter pins. The downside is they cost quite a bit more, but in the long run the lighter weight is a lot easier on the rotating assembly, especilly stock rods, and "Kid" will probably agree, easier on thin cylinder walls.
Roger

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kid vishus
Gearhead

Posts: 6590
From: middle of NC
Registered: Oct 2000

posted 03-17-2002 01:01 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Fordwiser:
The TRW L2348F is a domed piston for c/c heads, it's not real expensive and will take a lot of punishment (tough) but it is pretty heavy. There are several race piston manufactures JE/SRP,Aries,Wiseco,ect all of which should have lighter pistons and shorter lighter pins. The downside is they cost quite a bit more, but in the long run the lighter weight is a lot easier on the rotating assembly, especilly stock rods, and "Kid" will probably agree, easier on thin cylinder walls.
Roger

The TRW is a really tuff piston, and a good choice considering the other options out there. They are heavy, but not near as heavy as the Arias pistons I am going to use this upcoming year. The problem with running a cleveland is that the piston manufacturers dont make a light weight piston, or, in many cases, dont make anything for the cleveland in a dome. Everything they make now is either a flat top for really long rods or designed more for the Yates head. I have looked, the choices for "of the shelf" pistons that use stock rods is very limited.

Ross does make a domed piston for stock length rods that isnt quite as heavy, although I have heard they arent as tough and dont like to be "sprayed".

Most of my problems with the thin walls had alot to do with pistons tha were undersized and slapping around too much in the bore.

Also, the TRW with a 64 cc head, and the piston .005 "in the hole" will give you right around 12.8-1 compression. More than enuff to break thin cylinder walls, especially if its on the bottle.

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Fordwiser
Gearhead

Posts: 442
From: Metamora, Illinois
Registered: Dec 2000

posted 03-17-2002 01:36 PM     Click Here to See the Profile for Fordwiser   Click Here to Email Fordwiser     Edit/Delete Message   Reply w/Quote
The ones I have are domed JE, not sure if they are off the shelf or custom, since I was not the original buyer. Don't know the exact weight but I know they are lighter then the TRWs mostly because they use the 2.5 length pin, so the pin bosses are narrower. The thickness between the intake valve relief and the top ring is pretty thin so I don't think they would like nitrous, something to keep in mind when looking for cleveland pistons.
Roger

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kid vishus
Gearhead

Posts: 6590
From: middle of NC
Registered: Oct 2000

posted 03-17-2002 01:56 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Fordwiser:
The ones I have are domed JE, not sure if they are off the shelf or custom, since I was not the original buyer.
Roger

I looked in JE's catalog and didnt see any domed pistons offered. Myabe I just wastn looking in the right area.

Sounds like you have a nice set of pistons.

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futurattraction
Gearhead

Posts: 108
From: Iowa City, IA
Registered: Oct 2001

posted 03-17-2002 04:40 PM     Click Here to See the Profile for futurattraction   Click Here to Email futurattraction     Edit/Delete Message   Reply w/Quote
Kid V,
Does your JE catalog also show the SRP line or only regular JE? I'm curious if there are any SRPs available for the C motor. Thanks!
Scott

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kid vishus
Gearhead

Posts: 6590
From: middle of NC
Registered: Oct 2000

posted 03-17-2002 04:56 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
Mine just shows the JE line, but the shop I go to lets me look at any catalogs he has, and I dont remember seeing any pistons from SRP for the cleveland. I'll check tomorrow and make sure.

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DRAGSTANG351
Journeyman

Posts: 67
From: FLORIDA
Registered: Dec 2001

posted 03-17-2002 05:14 PM     Click Here to See the Profile for DRAGSTANG351   Click Here to Email DRAGSTANG351     Edit/Delete Message   Reply w/Quote
how about these pistons TRW-L2348F30 12.84:1
58.6 cc's or a KB149 12.7 W/62 cc's these are domed pistons, can i have the tops shaved off of these piston and make them work?

thanks for all the help and info
kelly

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DRAGSTANG351
Journeyman

Posts: 67
From: FLORIDA
Registered: Dec 2001

posted 03-17-2002 05:15 PM     Click Here to See the Profile for DRAGSTANG351   Click Here to Email DRAGSTANG351     Edit/Delete Message   Reply w/Quote
how about these pistons TRW-L2348F30 12.84:1
58.6 cc's or a KB149 12.7 W/62 cc's these are domed pistons, can i have the tops shaved off of these piston and make them work?

thanks for all the help and info
kelly

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kid vishus
Gearhead

Posts: 6590
From: middle of NC
Registered: Oct 2000

posted 03-17-2002 07:10 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by DRAGSTANG351:
how about these pistons TRW-L2348F30 12.84:1
58.6 cc's or a KB149 12.7 W/62 cc's these are domed pistons, can i have the tops shaved off of these piston and make them work?

thanks for all the help and info
kelly



Those TRW's are the same as the ones described earlier. They are forged, and tuff as nails. You can get that 12.8 with a 64 cc head if the block is decked. They figure the compression ratio off of the piston being .032 in the hole (and that is terrible for a race,or any motor).

The KB's, I dont know it they make a forged piston or not. And if it is a hyper pisotn, I owuld be afraid to spray it. I know lots of guys do it, but lots also try and fail miserably. The hyperuetectic pistons cant stand detonation. In my opinion, for a race motor, they are a glorified cast piston.

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Fordwiser
Gearhead

Posts: 442
From: Metamora, Illinois
Registered: Dec 2000

posted 03-17-2002 07:20 PM     Click Here to See the Profile for Fordwiser   Click Here to Email Fordwiser     Edit/Delete Message   Reply w/Quote
The TRW 2348 are a hollow dome, so you would cut thru the top making it a flat top, not sure about the other one. If you want a flat top, what's wrong with the ones you have?
Roger

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kid vishus
Gearhead

Posts: 6590
From: middle of NC
Registered: Oct 2000

posted 03-17-2002 07:34 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
It didnt sink in (to me) about the cutting the dome off part. I owuldnt do that. If you want flat tops, buy flat tops, but you wont get 12-1 witht hem unless you are running a Yates head or equivalent. The TRW's will give you around 12-1 with factory deck clearances (around .030) and 64-65 cc heads. Most closed chamber heads are aound 67-68 cc's from the factory (at least the ones I have bought).

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DRAGSTANG351
Journeyman

Posts: 67
From: FLORIDA
Registered: Dec 2001

posted 03-17-2002 11:47 PM     Click Here to See the Profile for DRAGSTANG351   Click Here to Email DRAGSTANG351     Edit/Delete Message   Reply w/Quote
well i thought my block was zero decked but i just checked my pistons are in the hole .018
so if i bought the TRW pistons and had a 64 cc chamber i should be over 12.1 comp ratio

how much is safe to mill off the heads?

i was told that my heads have already been milled .010

but i was also told my block was zero decked
and there sitting in the hole .018

thanks
kelly

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