ttt
New crate engine is now a steam engine....bad problem...
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Melting Slicks
Joined: Dec 2004
Posts: 2,101
Likes: 3
From: Cruising somewhere in St. Louis, Missouri
Latest Updates
From MsVetteMan:
Here's the latest. Motor is now fully assembled and ready for shipment back to blueprint/Marshall engines for their warranty inspection. I put it back together tonight in about 4 hours!! Not bad for a rookie.
Upon closer inspection of the #6 piston, the upper thin grooved area on the side wall (ring land area) has severe pitting or lodging of what looks like could be part of the piston top crammed into the grooves.
Here's the latest. Motor is now fully assembled and ready for shipment back to blueprint/Marshall engines for their warranty inspection. I put it back together tonight in about 4 hours!! Not bad for a rookie.
Upon closer inspection of the #6 piston, the upper thin grooved area on the side wall (ring land area) has severe pitting or lodging of what looks like could be part of the piston top crammed into the grooves.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Pistons: What Size Are They?
Originally Posted by luerja
From MsVetteMan:
Here's the latest. Motor is now fully assembled and ready for shipment back to blueprint/Marshall engines for their warranty inspection. I put it back together tonight in about 4 hours!! Not bad for a rookie.
Upon closer inspection of the #6 piston, the upper thin grooved area on the side wall (ring land area) has severe pitting or lodging of what looks like could be part of the piston top crammed into the grooves.
Here's the latest. Motor is now fully assembled and ready for shipment back to blueprint/Marshall engines for their warranty inspection. I put it back together tonight in about 4 hours!! Not bad for a rookie.
Upon closer inspection of the #6 piston, the upper thin grooved area on the side wall (ring land area) has severe pitting or lodging of what looks like could be part of the piston top crammed into the grooves.
Melting Slicks
Joined: Dec 2004
Posts: 2,101
Likes: 3
From: Cruising somewhere in St. Louis, Missouri
From MsVetteMan:
In reply to Jackson: All dimensions are in a previous post less than 3 or so pages back. Basically the cylinders measure 4.041 on average and with an average clearance of ..003. So, that would make the pistons size be 4.038, or 40 over pistons. That's the way I understand it.
MVM
In reply to Jackson: All dimensions are in a previous post less than 3 or so pages back. Basically the cylinders measure 4.041 on average and with an average clearance of ..003. So, that would make the pistons size be 4.038, or 40 over pistons. That's the way I understand it.
MVM
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
the top ring land is not the widest part of the piston (in fact it's about the narrowest) because the piston is barrel shaped , if it jammed in the bore you would have seen it jam on the skirts. However, it COULD jam if there was debris between the bore and the ring land...that would explain the verical scoring marks in the bores. It's hard to see those spots in the pics, any chance we can get a crisper pic?
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
? Size STAMP ?
Thoughout an owner inspection and subsequent one (if not two) local inspections ... has anyone looked at the pistons themselves for a size-stamp? ... what size is STAMP? ... & determined if pistons are STAMPED +30, +40 etc? ... and also compared that to pistons' skirt diameter? I had read earlier average bore was about 4.040" (4.041") and average clearance 0.003". But what say the pistons themselves? I can't be certain it'll be there, but I expect there's a factory-applied size STAMP somewhere on piston ... first place I'd look is on crown ... next, near a pin boss.
Originally Posted by luerja
From MsVetteMan:
In reply to Jackson: All dimensions are in a previous post less than 3 or so pages back. Basically the cylinders measure 4.041 on average and with an average clearance of ..003. So, that would make the pistons size be 4.038, or 40 over pistons. That's the way I understand it.
MVM
In reply to Jackson: All dimensions are in a previous post less than 3 or so pages back. Basically the cylinders measure 4.041 on average and with an average clearance of ..003. So, that would make the pistons size be 4.038, or 40 over pistons. That's the way I understand it.
MVM
Racer
Joined: Jun 2005
Posts: 409
Likes: 13
From: Lavonia Georgia
Originally Posted by jackson
I can't be certain it'll be there, but I expect there's a factory-applied size STAMP somewhere on piston ... first place I'd look is on crown ... next, near a pin boss.
Burning Brakes
Joined: Sep 2004
Posts: 1,167
Likes: 2
From: Ft.Worth Texas
Were the pistons measured on the skirts ninety degrees from the pin?
What did it measure?
If I was trying to get a piston to break above the ring like these have, I would cut some grooves above the ring just like these have. What the heck are those for?
What did it measure?
If I was trying to get a piston to break above the ring like these have, I would cut some grooves above the ring just like these have. What the heck are those for?
Last edited by David Ey; Mar 22, 2006 at 07:44 PM.