Re: SLIMMING DOWN A TRW SLUG
[Re: A/MP]
#2141092
08/26/16 01:25 AM
08/26/16 01:25 AM
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Joined: Feb 2005
Posts: 20,273 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,273
PA.
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I have a few sets of TRW forged 360 pistons. Any idea how I can remove some excess weight from the pistons? google this. how to lighten race pistons
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.38@138.67
Livin and lovin life one day at a time
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Re: SLIMMING DOWN A TRW SLUG
[Re: pittsburghracer]
#2141093
08/26/16 01:27 AM
08/26/16 01:27 AM
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Joined: Feb 2005
Posts: 20,273 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,273
PA.
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going with a lighter pin after you lighten them will help big-time.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.38@138.67
Livin and lovin life one day at a time
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Re: SLIMMING DOWN A TRW SLUG
[Re: pittsburghracer]
#2141313
08/26/16 02:56 PM
08/26/16 02:56 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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There was a guy who seemingly did that for a living. Can't remember his name or much else. But I found a company online; http://www.rebco-machine.com/About.cfmOne of the areas where they had extra material was in the piston crown, many are quite thick. Another place is the pin boss. I know it was talked about back in the day, when you couldn't buy custom forged pistons at the corner drug store. R.
Last edited by dogdays; 08/26/16 03:01 PM.
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Re: SLIMMING DOWN A TRW SLUG
[Re: Monte_Smith]
#2141403
08/26/16 05:30 PM
08/26/16 05:30 PM
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Joined: Jan 2003
Posts: 75,282 A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,282
A gulag near you.
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Machine time is money. How effective do you think this will be in dollars spent vs results, compared to just buying some nice pistons Please do not confuse the issue with logic.
Mainstream Media is the new Pravda
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Re: SLIMMING DOWN A TRW SLUG
[Re: JohnRR]
#2141407
08/26/16 05:48 PM
08/26/16 05:48 PM
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Joined: Feb 2005
Posts: 20,273 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,273
PA.
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A friend I bought my 1969 Dart from 30 plus years ago sold off everything he owned in PA and moved to Florida to get into the pizza business. After serveral years he became Friends with some MOPAR Super Stock racers and they put him to work (FREE labor). His job was to take brand new Venollia Pistons out of the box and hand-grind the piston under dome and pin boss area till the pistons came into a certain super lite weight. At this point the piston only lasted 50 passes and were removed and scraped so YES it can be done. but I sure as heck wouldn't want to start with some of the heaviest pistons out there.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.38@138.67
Livin and lovin life one day at a time
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Re: SLIMMING DOWN A TRW SLUG
[Re: fbs63]
#2141456
08/26/16 07:46 PM
08/26/16 07:46 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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As I alluded to above, there was a time when the ONLY forged pistons you could get for most engines were TRWs. Back then Speed Pro was a competing brand.
So if you wanted to race something different you sent your TRW clubs out to be lightened. Or you found a way to use a different engine family's lightweight forged pistons.
I had a friend who used to race Pontiacs and he had a devil of a time because the only forged connecting rods for Pontiac that'd work in his 400 were factory from 58 to 62, something like that. And they weren't stout either but they didn't fail like the later cast rods did.
Back to now.......The OP has a stash of brand new heavy forged pistons and a new set is starting to cost something like $800, unless you can find a sale or shop cleanout. So if the pistons right now are pretty worthless, if he invested say $200 in a set to get them lightened up to the point where he'd want to use them, he'd be money ahead.
To the OP: If you have more than one set of the same piston maybe you could get a discount because their setup time would be reduced.
Now I feel better!
R.
Last edited by dogdays; 08/26/16 07:48 PM.
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Re: SLIMMING DOWN A TRW SLUG
[Re: A/MP]
#2141786
08/27/16 11:09 AM
08/27/16 11:09 AM
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Joined: Jan 2003
Posts: 1,238 North Central, Indiana
Roughbird72
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,238
North Central, Indiana
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I have a few sets of TRW forged 360 pistons. Any idea how I can remove some excess weight from the pistons? As stated already, is the work worth what little you may gain? You may be able to sell 2-3 sets and then buy set of Diamond,Ross,Wiseco,etc.
72 Plymouth Roadrunner 11.08@123.25
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Re: SLIMMING DOWN A TRW SLUG
[Re: Roughbird72]
#2141815
08/27/16 12:15 PM
08/27/16 12:15 PM
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Joined: May 2003
Posts: 6,621 Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,621
Downtown Roebuck Ont
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I have a few sets of TRW forged 360 pistons. Any idea how I can remove some excess weight from the pistons? As stated already, is the work worth what little you may gain? You may be able to sell 2-3 sets and then buy set of Diamond,Ross,Wiseco,etc. You don't suppose the man has his own mill and is looking for guidance on how/where to remove/not remove material so he still has a piston when he is done and not a paper weight?? Kevin
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Re: SLIMMING DOWN A TRW SLUG
[Re: A/MP]
#2141820
08/27/16 12:24 PM
08/27/16 12:24 PM
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Joined: May 2015
Posts: 1,134 Lost in Time
Iowan
super stock
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super stock
Joined: May 2015
Posts: 1,134
Lost in Time
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I have a few sets of TRW forged 360 pistons. Any idea how I can remove some excess weight from the pistons? Put them on a UPS truck and send them to a new owner. It's like that old joke, I just lost 200 lbs of ugly fat, how? I got a divorce!
Have a great day Iowan
"obsolete is neat"
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Re: SLIMMING DOWN A TRW SLUG
[Re: A/MP]
#2141848
08/27/16 01:19 PM
08/27/16 01:19 PM
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Joined: Feb 2008
Posts: 725 Central TEXAS!!!!
sr4440
super stock
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super stock
Joined: Feb 2008
Posts: 725
Central TEXAS!!!!
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call Eric at Rebco Machine and ask how much weight he can remove and the cost. Then you can make a informed decision on what direction to go. all they do is modify pistons.
316-440-2828
Without Data, youโre just another guy with an opinion.
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Re: SLIMMING DOWN A TRW SLUG
[Re: Twostick]
#2141889
08/27/16 02:10 PM
08/27/16 02:10 PM
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Joined: Dec 2006
Posts: 3,401 Pa
Hot 340
master
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master
Joined: Dec 2006
Posts: 3,401
Pa
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I have a few sets of TRW forged 360 pistons. Any idea how I can remove some excess weight from the pistons? As stated already, is the work worth what little you may gain? You may be able to sell 2-3 sets and then buy set of Diamond,Ross,Wiseco,etc. You don't suppose the man has his own mill and is looking for guidance on how/where to remove/not remove material so he still has a piston when he is done and not a paper weight?? Kevin So true. A lot of the people I know either own, or have access to a mill to play around with. Send them here or buy that. I think the op just want to use what he has without ruining them. Not everyone wants to or cares to run 8's with the latest greatest lookie what I bought parts. Sometimes life just doesnt allow it.
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Re: SLIMMING DOWN A TRW SLUG
[Re: Twostick]
#2141907
08/27/16 02:57 PM
08/27/16 02:57 PM
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Joined: Jan 2003
Posts: 1,238 North Central, Indiana
Roughbird72
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,238
North Central, Indiana
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I have a few sets of TRW forged 360 pistons. Any idea how I can remove some excess weight from the pistons? As stated already, is the work worth what little you may gain? You may be able to sell 2-3 sets and then buy set of Diamond,Ross,Wiseco,etc. You don't suppose the man has his own mill and is looking for guidance on how/where to remove/not remove material so he still has a piston when he is done and not a paper weight?? Kevin I've been a machinist for 20+ years, have access to equipment & i wouldn't spend my time on them ... time is money.Unless he has to use them for some class rule, I would sell them & buy a better,lighter set of pistons. If this is on a street/strip or bracket car that's not going to be turning a lot of rpms, i doubt it would make a difference over an untouched piston. You'd be surprised how much material you have to take out to make 10-15 grams, been there done that. A lot of the guys here have probably run in the 9s with the older TRW/SP heavy slugs, but it takes a toll on the rest of the rotating assembly.
Last edited by bubby440; 08/27/16 03:14 PM.
72 Plymouth Roadrunner 11.08@123.25
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Re: SLIMMING DOWN A TRW SLUG
[Re: A/MP]
#2141923
08/27/16 03:18 PM
08/27/16 03:18 PM
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Joined: Jan 2003
Posts: 14,539 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,539
So. Burlington, Vt.
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I think Montes point was..... Even if you took out 50 grams, unless it's a pretty high effort combination(like the kind where you wouldn't even consider using these pistons in the first place), there will likely be almost zero gain in ET.
Fwiw, my friends NHRA "spare" stocker motor uses trw pistons(unmodified as per the rules), and it runs within about a tenth of the one with the high dollar pistons in it(which is also about 6 cubes bigger).
68 Satellite, 383 with stock 906โs, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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