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  #1  
Old 07-05-2003, 11:26 PM
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dave571 dave571 is offline
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Default kb-silvolite piston feedback?

Any feedback from mopar land?


I've heard they are having problems with thier 408 pistons.

I'm more interested in the big block ones, anyone has tried.

Consistant weights(relatively, of course)?

Heights and stuff seem to be as specified?

Durability?(Not collabsed after a year or what?)

All feedback welcome.
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  #2  
Old 07-05-2003, 11:44 PM
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Mister Fiberglass Mister Fiberglass is offline
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I have heard of three guys breaking the head of the piston ....... and then that takes the whole motor with it.

The pistons I hear are very brittle.

I would never use that type of piston....ever.
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  #3  
Old 07-06-2003, 12:30 AM
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Cool Never used them but.......

The ring clearance is very critical. You MUST gap the rings according to suggested specs. A lot of broke pistons when they first came out because of that. I have seen a set out of a sbc that was ran for 2 years on the dirt track and they were in great shape. You must get the proper end gap or else broken pistons with these.

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  #4  
Old 07-06-2003, 01:45 AM
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I build several 400 plus hp engines every year with them. Very close in weight and sizes. Very happy with them. As mentioned before top ring gap is critical. It's up closer to the surface than most. The upper should be gapped about 18 and the second ring can be stock to like 16 at the most. Never lost a piston yet. Never had a brittle problem with them either. Course we dont have det problems on 110 race fuel either. But over all great pistons.
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  #5  
Old 07-06-2003, 01:45 AM
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Mister Fiberglass Mister Fiberglass is offline
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Confused

I have never used them either............

BUT you are saying that butting end gaps of the rings will break the piston ??

Now that is a fragile piece .......... IMO.
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  #6  
Old 07-06-2003, 01:48 AM
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A lot of cast or hyper pistons with the upper grove up high like these will bust if the gaps butt. Too close to the top I think. They should be lowered some. Some pistons have a heat sink and then a ring land. I might try some r&d and move the ring land and leave the top one as a heat sink and see what it does.
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  #7  
Old 07-06-2003, 04:07 AM
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Due to the thin face, they will blow through if you have detonation (ping).
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  #8  
Old 07-06-2003, 07:39 AM
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I have a friend who runs 13:1 KB's at the track for 3 years now and no problems at all. The ring gap is critical as they say in their web page. The piston is a good cross between cast and forged at a low price. Not as strong as forged but better than cast. I just bought a set for my +.30 400 big block.
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  #9  
Old 07-06-2003, 10:30 AM
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custom880; Glad you mentioned there web site. Most people over look the sites.

Anyway. I have run them in the street for a while now. No problems at all. And, I'm not kind.
The biggest problem I have seen is 1 of 2 being;

1.) Ring end gap
2.) abuse understress in example of poor timing, and or fuel quality/octane issue that leads to pinging.

They tell you that the piston can fail under detonation. Which should never happen no matter what piston you have anyway.

The ring gap issue. If you didn't read the instuctions to a piston they tell you needs a critical gap, well, you got what you deserved.
The silicone makes it stronger but brittle is a catch 22.

I can understand when Mr. Fiberglass says he would never use them when you read all these people braking them. He ethier will use a cast piston for stock to mild build or he steps up to the plate and drops the coin on a quality forged unit.
Sometimes, it just makes good sense. Overkill? Maybe. Long life from overkill? More than likely. (LOL)

Also, theres allways a group of people tring to push 600 HP (from 300 cubes for example) , out of these things at crazy abuse levels. Ethier drag or dirt track. Right piston for the right application.
For the street, I say no problem.

Last edited by rumblefish360 : 07-06-2003 at 10:33 AM.
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  #10  
Old 07-06-2003, 11:35 AM
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i've got kb-107's flat tops in my 360. there have been no problems with mine.
i think it all comes down to attention to detail.

the manufacturer doesn't have instructions about assembly written for nothing you know.
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  #11  
Old 07-06-2003, 12:23 PM
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Just finished a 451 for a customer. Don't care for the Micky Mouse roll pin oil ring locating setup. All were same weight to a gram. The long Mopar rods will probably let the KB's live longer under adverse conditions. Large top ring end gap is a little scary but doesn't have a lot of blowby.
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  #12  
Old 07-06-2003, 06:58 PM
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Hay......some(MOST !!) of them have to be OK - they must have sold thousands of sets.

Does anyone have a spec on where the top ring is on these pistons? ........... vs a same application forged or OEM cast piece?
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