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Ridge reamer or not?

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Les...fortunate

08-16-2003 11:38:53

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The young man who's working on my SC is anxious to put the engine back together and see what it sounds like. I borrowed a ridge reamer for him to use but it is broken. Should I scrounge around for another one or put it back together and take my chances with the ridges?

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Don LC

08-18-2003 04:52:48

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Re: Ridge reamer or not? in reply to Les...fortunate, 08-16-2003 11:38:53

Remove the ridge..... ..rent one at a tool rental.....be careful of the work this guy does..... use plasti guage on all the bearings.....fit the rings and stager the gaps.....we all know what they sound like....

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Les...fortunate

08-17-2003 17:36:16

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Re: Ridge reamer or not? in reply to Les...fortunate, 08-16-2003 11:38:53

Rod, I don't seem to have your email address. Thought I did but I don't.
Will your reamer work for these 3.625" pistons/cylinders?

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Rod (NH)

08-18-2003 08:04:40

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Re: Re: Ridge reamer or not? in reply to Les...fortunate, 08-17-2003 17:36:16

Yep, the reamer goes from 3" to 5" diameter. Address should now show up above. If it does not, use thompson@worldpath.net.

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Dick L

08-17-2003 12:34:07

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Re: Ridge reamer or not? in reply to Les...fortunate, 08-16-2003 11:38:53

One thing that I didn't see anyone address was that if the new rings are fit to the cylinder bore with the proper ring end clearance down in where they work, which I would guess the clearance would be, without looking it up, would be around .007. With the ridge still at the top you would take a big chance of breaking or chiping a ring when trying to install the rings after they were installed on the pistons.

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davidval

08-16-2003 22:44:49

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Re: Ridge reamer or not? in reply to Les...fortunate, 08-16-2003 11:38:53

there were (and maybe still are) ring manufecturers that built special rings for unremoved ridge (with a step in the ring) one of them was "atexform" from tarabusi, spain. look it up

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george md

08-16-2003 20:17:54

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Re: Ridge reamer or not? in reply to Les...fortunate, 08-16-2003 11:38:53

Les, Basically if an engine needs ridge reamed, it needs new liners or a bored block needs to be bored . Now having said that , I am assuming that you are going to hone it using a rigid ,adjustable hone.Worn cyl's are tapered and when you hone them
you wear the stones on the hone to match the taper,at that point they are no longer useful to
hone a fresh bored cyl as they will transfer the
taper to the new cyl wall. Therefore if you do not ridge ream the cyl , the ridge will act as a stone
dresser as you hone the worn cyl ,and will help you remove some of the taper as you hone . Spring
loaded hones do nothing to correct taper or the
inherent out of round condition that goes with cylinder wear.They are best left in the store .

george

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carheadus

03-10-2005 17:30:18

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Re: Re: Ridge reamer or not? in reply to george md, 08-16-2003 20:17:54

if your taper and cylinders are otherwise not too bad,cut the ridge and use a spring loaded cylinder hone. the hone is used to cut the glaze
not to shape your cylinders. that is what boring is for. sorry to contradict you george. go back to school.

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george md

08-16-2003 20:22:15

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Re: Re: Ridge reamer or not? in reply to george md, 08-16-2003 20:17:54

As you hone the ridge will disappear leaving a

better job than reaming.

george

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Gene Davis(GA)

08-16-2003 19:16:27

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Re: Ridge reamer or not? in reply to Les...fortunate, 08-16-2003 11:38:53

Last time that I put an engine with a ridge in the cylinder back together without removing it, it had an annoying ticking sound because the ring would barely touch the less than finger nail deep ridge an was ticking,the top ring was showing some slight pounding in the groove learned my lesson then at my expense of doing the job over at no cost to the customer. ALWAYS!!!! take the ridge out, and sometimes on large bore engines, have even used a sanding flap wheel if no ridge reamer large enough was available, messy to clean up behind though. Gene

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buck

08-16-2003 18:06:44

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Re: Ridge reamer or not? in reply to Les...fortunate, 08-16-2003 11:38:53

Les now you have the oppertunity to teach your young mechanic how to check to determine if the ridge needs to be removed. If you can hook your fingernail on the ridge then it must be removed. If he will use this simple guide then he will not run into trouble on your engine or any others he will be working on.

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RAB

08-16-2003 14:30:17

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Re: Ridge reamer or not? in reply to Les...fortunate, 08-16-2003 11:38:53

If the ridge is considerable, it must be removed as lower posts say, also check side clearance of new rings in piston grooves. Top one may be well out of spec. The grooves can be machined and a steel insert fitted to bring them back to spec.
Regards, RAB

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Rod (NH)

08-16-2003 14:13:11

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Re: Ridge reamer or not? in reply to Les...fortunate, 08-16-2003 11:38:53

Hi Les,

Beg, borrow, buy, rent or steal a ridge reamer. I agree with jake. Your mechanic is over-anxious. Look for another one next time. Jerry has an interesting thought about tapering the lower (edge of the?) ridge. However, I am unable to see any easy, practical way to do this acurately in the field. Too risky for my liking. I have removed some pretty hefty ridges from the tops of cylinder walls with no obvious detriment to compression. A carefully calibrated comparison test might show up some difference but my guess is that it would be relatively small.

Do it right. Get rid of that ridge completely now while it is easy to do so. Then you know it will not cause problems later.

Rod

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Les

08-16-2003 14:19:42

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Re: Re: Ridge reamer or not? in reply to Rod (NH), 08-16-2003 14:13:11

Don't be so hard on the mechanic. We have a friendly thing going here. He just turned 16. He's not my "hired man". We're friends. Believe me, I've put him and his family out way more than what he'll ever get out of this project. Glad you checked in, Rod. Haven't heard much from you lately. One of these days you'll see me pulling into your yard with my little white Co-op truck.

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Rod (NH)

08-16-2003 14:49:59

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Re: Re: Re: Ridge reamer or not? in reply to Les, 08-16-2003 14:19:42

Ah, sixteen. That explains the over-anxious. Didn't mean to be so hard. If I had known the arrangement, I wouldn't have said it. My apologies to your friend. I can remember sixteen...with great difficulty but with fond memories :o).

By the way, you are welcome to borrow my ridge reamer. So truck that Co-Op vehicle right down here. It's only about an hour away. I won't be using it for a long time so you could return it at your convenience, even next Spring. Serious.

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Jerry L.I. . N.Y.

08-16-2003 12:18:40

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Re: Ridge reamer or not? in reply to Les...fortunate, 08-16-2003 11:38:53

Do not get upset , it can be done both ways. Your rings do not travel over the ridge , your new bearings will prevent that. But taper the bottom ridge to prevent breaking ring. this saves the compression at top of stroke.If you remove ridge you will lose that part of cyl. and lose compression. A fork-lift eng. re-building co. showed this to me in 1954, and it did work .
Sincerely , Jerry

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jake

08-16-2003 11:56:23

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Re: Ridge reamer or not? in reply to Les...fortunate, 08-16-2003 11:38:53

Rent ome but don't ever put an engine together with a ridge, busted rings is the least that could happen. Also get another mechanic [?]

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Les

08-16-2003 22:14:36

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Re: Re: Ridge reamer or not? in reply to jake, 08-16-2003 11:56:23

See post above. He is not my "mechanic", he is my friend.

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Don H

08-16-2003 11:55:01

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Re: Ridge reamer or not? in reply to Les...fortunate, 08-16-2003 11:38:53

Ridges can break the top ring. That is why you should remove them. If they are not to bad you will probably get away with it. I would remove them if it was mine.

Don

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