Subject: Re: cylinder/piston advice needed!
Author: andy hill
Date: Sep 10, 2001, 12:24 PM
Post ID: 1708180022
hi gary-
thanks! i have an eldo drive- the engine/trans. were ambo, tho- this bike
was origionally put together from parts in washington state [forget the
dealer's name].
i see your point- i'm gonna have my xtra heads done right. it's almost
gotta be the prob.!!
andy
----- Original Message -----
From: "Gary Cheek" <kg8-@home.com>
To: <Loopfram-@topica.com>
Sent: Monday, September 10, 2001 07:07 AM
Subject: RE: cylinder/piston advice needed!
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Are you using the 5 speed trans with the original Ambo rear drive
gearing ?
The Ambo is 4.375:1 and the Eldo 5 speed used 4.625:1 and had 100 ccs
more to boot!It also had a different primary reduction in the trans.
The 30 Lbs is a pretty large spread,but I have had folks bring bikes
into the shop with a much larger spread and they still pulled
surprisingly strong.
It is easy to break down the rig edges on the cylinder chafer when
installing the cylinders. the chafer is as rough as a file and harder
too ! Valve lapping is also easily overdone and is not really a good
practice for used valves/seats. It is for better to machine cut (IE
"KWIK WAY equipment) or grind the seats and valves. If you MUST you can
LIGHTLY lap them after machining.
The problem with lapping used seats ( ONE of the problems)and valves
is the valves usually have a worn groove from the contact with the seat
and lapping only cuts it deeper. the grooves do not seal or flow well at
all.
A cylinder leak down test as others have suggested is a good start.In
the meantime it would be nice to see valve lapping go the way of the
snow goose!
When you do get the egine sorted out you may fid the Eldo rear drive
will make a huge differnce in the way your Ambo scoots down the road.
andy hill wrote:
| hunter- thanks- i'll run it a few more miles. seems weird- the ##'s i got are xactly the same as the ones from the old ambo engine! [???] at least the spiffy new 5-speed works well! andy '72 eldo [for real!] ----- Original Message ----- From: "Hunter Jones" <rjon-@nc.rr.com> To: <Loopfram-@topica.com> Sent: Sunday, September 09, 2001 05:23 PM Subject: Re: cylinder/piston advice needed! ============================================================ Audible lets you LISTEN to the latest best sellers by Stephen King, Anne Rice, James Patterson and so much more. Choose from the hottest in fiction and nonfiction, download and listen on your free MP3 player! http://click.topica.com/caaademb1dfltb1mNhka/Audible ============================================================ Andy, If you are reasonably sure that the valves are OK AND have run the engine long enough for the rings to develop some kind of positive karma in their new home AND the compression is nearly the same as before AND you are not sure of the bike's past THEN it may be possible that you have a difference in combustion chamber volume. There is no telling what a PO may have done or had done to it. Do a leakdown test if you can to determine where and how much leakage the cylinders have and if they are within reason. If so then pull the heads off and cc them. That is measure the volume of the combustion chamber. Also make sure that the pistons are the same and come to the same height in the bores. If you don't know how to do any of this stuff I'm sure one of us can help. Hunter At 04:37 PM 9/9/2001 -0400, you wrote:
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Gary Cheek
1971 Ambassador (I think it's sold)
1972 Eldorado Police
1974 Eldorado 4LS/Amal carb civilian
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