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What now?

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bpineo
Member
Username: bpineo

Post Number: 15
Registered: 05-2008
Posted on Monday, August 10, 2009 - 08:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have a 4 HP Lathrop that has been abused/ run hard over the years. I have gone through it only to find very little / poor compression. I have purchased new rings, however there is too much clearence (almost .008") between the rings and the land. There is a small amount of space between piston and cyl. wall that does not seem to be out of the ordinary when compred to my other engines. No ridge exists and the bore looks great. I get a great seal on the base with a strong/sharp new charge into the cyl., however there is hardly any compression to fire the charge. Is this sleeve time or new piston? Special rings? What now?
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ernie
Senior Member
Username: ernie

Post Number: 1003
Registered: 01-2002


Posted on Tuesday, August 11, 2009 - 01:16 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Brandon,
Send me an e-mail and I will give you my phone number.
I also have the head for Ray's engine
Ernie
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billschaller
Senior Member
Username: billschaller

Post Number: 284
Registered: 12-2003


Posted on Tuesday, August 11, 2009 - 08:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

if the bore is good, then look into building up the piston, either flame welding it, or sleeving it, and then machine in new ring lands. I know people who have done both with satisfactory results.
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robert
Senior Member
Username: robert

Post Number: 288
Registered: 07-2003
Posted on Thursday, August 13, 2009 - 12:50 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Is that preferable to sleeving and boring the cylinder?
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ernie
Senior Member
Username: ernie

Post Number: 1005
Registered: 01-2002


Posted on Thursday, August 13, 2009 - 01:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Basically purchase rings that are too wide and cut the ring grooves to match the new rings with .002 to .003 thou side clearance
We can discuss it on Sat at Mystic
Ernie
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bpineo
Member
Username: bpineo

Post Number: 16
Registered: 05-2008
Posted on Monday, August 17, 2009 - 08:36 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thank you for all of your advice. I will post when solved. Brandon

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