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Originally Posted by mike tkach
(Post 4232785)
i don,t think he means bent because he stated that detonation causes the piston to TWIST.back in my racing days i met a lot of nitrous guys who would push it past the limit.serious detonation can ruin an engine in less than a second.one time a guy took the head off and it and what was left of the piston looked like someone was in there with a torch but no TWISTED rod.
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Originally Posted by Full Force
(Post 4232580)
Amazes me... I am not re-using any of it in my new builds, all new even blocks...cranks were even hitting bottom of pistons!!! how do you not feel or see that when ASSEMBLING?
But I didnt twist a rod!!! LOL [ATTACH=CONFIG]534062[/ATTACH][ATTACH=CONFIG]534063[/ATTACH] |
142985 547 4.530 4.250 6.385 9.780 1.270
part # CID Bore Stroke Rod Deck C.H. Whats the measurement from center of crank to O.D of counter weight ? |
Originally Posted by MER Performance
(Post 4232822)
That was surely a "rookie build" if those were 6.385 rods, trying to figure how the counter weight, scrubbed the piston. What is the compression height of the piston ? 540 CID build; correct ? Using a 6.385 counter weighted crank, with a 6.135 rod and trying to have a taller C.H. on piston, to bring piston up to -.025 D.H.
1-crank is 4.375 stroke 2-rods are 6.385 never measured them but the paperwork said they were that Dave gave me. 3-pistons say for 540 kit the pistons were at least .020 out of the hole, blocks 4.5030 I have no clue how you can build the rotating assembly and have it hit piston skirts, how the hell did he rotate it? this is the guy, look at his garage if this works, thats enough to tell me bad news... I have no idea why my buddy went to him... https://www.facebook.com/profile.php...774194&fref=ts |
1 Attachment(s)
Originally Posted by MER Performance
(Post 4232831)
142985 547 4.530 4.250 6.385 9.780 1.270
part # CID Bore Stroke Rod Deck C.H. Whats the measurement from center of crank to O.D of counter weight ? .[ATTACH=CONFIG]534094[/ATTACH] |
Originally Posted by Knot 4 Me
(Post 4232733)
You'd think it would just bust the wrist pin out of the skirt as opposed to twisting the rod. This is the only way I've seen them "twisted". Pics would be cool!
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But it looks so easy to build a motor on Powerblock tv!
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Originally Posted by Black Baja
(Post 4232857)
That's not bent or twisted. It's slightly curved.
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Originally Posted by Full Force
(Post 4232837)
Honestly I still have no clue what this guy did...what I have found out so far (hence starting with all new parts and none of this used again)
1-crank is 4.375 stroke 2-rods are 6.385 never measured them but the paperwork said they were that Dave gave me. 3-pistons say for 540 kit the pistons were at least .020 out of the hole, blocks 4.5030 I have no clue how you can build the rotating assembly and have it hit piston skirts, how the hell did he rotate it? this is the guy, look at his garage if this works, thats enough to tell me bad news... I have no idea why my buddy went to him... https://www.facebook.com/profile.php...774194&fref=ts Not the best combination for a 4.375 crank in a 9.800 deck block |
Originally Posted by Black Baja
(Post 4232857)
That's not bent or twisted. It's slightly curved.
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I was trying to digest; Full Forces, build here. I just finished off 10 oz of magnesium citrate, lets see what happens.
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Originally Posted by MER Performance
(Post 4232884)
Running a 4.375 stroke, 6.385 rod CH of 1.270 would take you .042 out of the hole. If you had a .050 thick gasket the piston would rock and hit. Someone machined pistons down, either a custom piston would be needed or use a 6.535 rod with custom piston having a 1.077 C.H. I'm pretty sure the ring stack would work being its a NA build. I have no idea how you, can swing that piston and rod length around that counter weight unless, you machined down counter weights.
Not the best combination for a 4.375 crank in a 9.800 deck block |
I'm surpised they didn't clatter like a diesel!!
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Originally Posted by Knot 4 Me
(Post 4232904)
I'm surpised they didn't clatter like a diesel!!
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Originally Posted by Full Force
(Post 4232901)
Oh the pistons were ever so slightly touching the heads... Inwill post pics when I get home same as his hack grinding on crank I would assume from hitting pistons... I never seen such a cluster fuk build before I wish I would have never bought the scarab to get em!
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Originally Posted by MER Performance
(Post 4232911)
That mess can be corrected, without, throwing it all in the trash.
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Originally Posted by Full Force
(Post 4232901)
Oh the pistons were ever so slightly touching the heads... Inwill post pics when I get home same as his hack grinding on crank I would assume from hitting pistons... I never seen such a cluster fuk build before I wish I would have never bought the scarab to get em!
Looks like "Goober with the green teeth" assembled yours. That would have to be very noticeable when hand turning that when first put together. Wannabe |
6 Attachment(s)
Originally Posted by wannabe
(Post 4232923)
Thats why machining is so critical in engine building. People often forget that and focus on "the parts" .
Looks like "Goober with the green teeth" assembled yours. That would have to be very noticeable when hand turning that when first put together. Wannabe [ATTACH=CONFIG]534109[/ATTACH][ATTACH=CONFIG]534110[/ATTACH][ATTACH=CONFIG]534111[/ATTACH][ATTACH=CONFIG]534112[/ATTACH][ATTACH=CONFIG]534113[/ATTACH][ATTACH=CONFIG]534114[/ATTACH] |
Wish the crank didn't need to be cut. I'd buy it. Buy I'm a picky ***** and only like std.
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Originally Posted by lil red
(Post 4232958)
Wish the crank didn't need to be cut. I'd buy it. Buy I'm a picky ***** and only like std.
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It would appear he ground the chit out of the counter balancer's trying to get clearance so it needs more than cut . Needs re-balanced imo .
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Originally Posted by the deep
(Post 4232976)
It would appear he ground the chit out of the counter balancer's trying to get clearance so it needs more than cut . Needs re-balanced imo .
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So what rods were those, FF?
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Originally Posted by Cole2534
(Post 4233005)
So what rods were those, FF?
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i don,t think the rods were the problem,lol.i think the problem was a bad builder with mis matched parts.
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Originally Posted by mike tkach
(Post 4233107)
i don,t think the rods were the problem,lol.i think the problem was a bad builder with mis matched parts.
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It is a shame to see this type of work being done by a so called engine shop, but I believe this happens more than we know not only in the marine arena, but automotive as well. I can't see how these places continue to stay viable. Hard to believe!
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Originally Posted by abones
(Post 4233117)
It is a shame to see this type of work being done by a so called engine shop, but I believe this happens more than we know not only in the marine arena, but automotive as well. I can't see how these places continue to stay viable. Hard to believe!
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Originally Posted by Cole2534
(Post 4233126)
They apparently have really high margins...of profit.
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