Subject: Re: cylinder/piston advice needed!
Author: andy hill
Date: Sep 10, 2001, 5:20 PM
Post ID: 1708183645
gary-
hi- this drive unit is the deep sump style, and it seems to go down the
road well, but lacked the power i anticipated. also, if i remove the left
sparkplug, and rotate the engine [with a wrench] with my thumb on the
sparkplug hole, there isn't enough compression to pop my thumb loose. it's a
very faint pressure @ tdc.
you were right- when i lapped the valves, only about 1/8 in. around the
outside of the valve seat was affected. the rest of the seat does not touch
the valves [it's the same for all 4 of them, in fact]. So, i ran my T-3
heads up to the machine shop for a proper grinding. shoulda done it in the
first place. the maryland rally draweth nigh!! woohoo!
thanks again,
andy
----- Original Message -----
From: "Gary Cheek" <kg8-@home.com>
To: <Loopfram-@topica.com>
Sent: Monday, September 10, 2001 07:06 PM
Subject: RE: cylinder/piston advice needed!
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Of course you want the heads to be right ,but I think the main problem
you are facing is gearing. You are starting out with gearing in first
gear somwhere between 1st and second. This results in substantialy less
torque at the rear wheel in every gear ,for a given engine speed. I hope
you will try to remedy the gearing!
andy hill wrote:
| 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! ============================================================ Join memolink.com and get FREE gift certificates to Wal*Mart, Target, Best Buy, Olive Garden and more! http://click.topica.com/caaac5Rb1dfltb1mNhka/Memolink ============================================================ 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:
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Gary Cheek 1971 Ambassador (I think it's sold) 1972 Eldorado Police 1974 Eldorado 4LS/Amal carb civilian ============================================================ Explore the jungle in your backyard -- FREE! eNature has bird sounds, Animal Finder, Field Guides, experts, activities and more for a suburban safari you'll never forget. http://click.topica.com/caaac1Nb1dfltb1mNhkf/eNature ============================================================ |
Gary Cheek
1971 Ambassador (I think it's sold)
1972 Eldorado Police
1974 Eldorado 4LS/Amal carb civilian
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