I under stand if you can not go bigger. But it sounds like some put sleeves in even if they have room to bore more.
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Without something detremental like a cracked cyl wall or the last boring job that put the cyl's badly out of line I would not sleeve. No replacement for displacement. JMHO. Rod"Much of the social history of the Western world, over the past three decades, has been a history of replacing what worked with what sounded good." Thomas Sowell -
I sleeved back to standard in my coupe, and that seems to have been one cause for my overheating problem, because the sleeves were honed to .003 per mfg. specs. After rehoning to .0045, no more overheating. Something to do with heat dissipation and sleeves, I think.Comment
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Possibly, Ray, but even without sleeves I always hone my cylinders out to .0035 cyls 1 and 2, and .0045 cyls. 3 and 4.
As far as I am concerned, you would never be wrong to hone them all to .0045 sleeves or not.
And as you know, we have built a lot of motors here, and not just Model A. I have never experienced piston slap in any motor we have ever built
Note, we are most always using cast pistons in an A.
If this were a case of forged pistons, which we are putting in the '47 Stude, then the manufacturer will tell you the clearance, and you will be able to believe it, since forged pistons do not expand as much. More pricey, tho. Instead of 100 bucks a set, think 1000 bucks a set.
For forged, think Ross pistons, etc, and not these no-name jewels we get from the suppliers. For a Model A, I actually use a piston supplied by Egge, at 250 bucks a set, and will use no other.
Those little slips of paper that come with the cast Model A pistons that say 'use .002' lieLast edited by tbirdtbird; 01-19-2018, 10:56 PM.Comment
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Like a bore job,the sleeve is only as good as the guy setting it.Been around wet and dry liners for years,dry pressed in are fool proof.Gives a block as second life,and acts like a pin with any cracks.Comment
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How much smaller do you recommend boring the block then the sleeve OD size?Last edited by George Miller; 01-20-2018, 11:19 AM.
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As you know Dave, you were a big help in my getting this engine back to right. Since the .0045 hone it has run perfectly. No seizing, no overheating, lots of pep! My little slip of paper said "use .003." Which I did. Big mistake!Originally posted by tbirdtbird View PostLast edited by Ray Horton; 01-20-2018, 11:50 AM.Comment
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Excellent thread, and a good read. Thank you, for starting this conversation. JeffComment
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I going with tbird. To big is better than to small in this case. The back two cylinders need all the help they can get. scored cylinders are not good.Comment
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Brent, of course this is VERY true:
"With regard to bore clearances, I believe someone needs to clarify these numbers suggested above are to be calculated off of actual piston sizes"
Not everyone has the proper equipment to take these measurements or even a dial bore gauge to truly know the cylinder bore accurately. This stuff is often better left to a qualified engine builder
Ray, I am glad that your engine troubles are over! You had enough miseryComment
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Brent- BRENT in 10-uh-C commented
- Today, 07:36 AM
Do you know who the piston manufacturer is that is putting those slips of paper in? I use Pistons coming from Snyders (-which don't come with any paper slips), and I have always wanted to heat a piston in an oven and then measure it to verify the amount of thermal expansion it actually has. It would be interesting to compare the two pistons to see if the pistons that come with the paper slips has similar expansion rates.
- Today, 07:36 AM
What do you set your piston to wall clearance at on the Snyder pistons? Do you keep them all the same or add more for 3 & 4?3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctrComment
- BRENT in 10-uh-C commented
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Cylinders are bored out from Standard to 0.125.
What are the pros and cons of each:
Standard:
0.020:
0.030:
0.040:
0.060:
0.080:
0.100:
0.125:
Thanks.
Pluck08-10-2021, 07:59 PM -
Getting back to an old project I have broken down an model a engine I picked up years ago. The pistons have 4 rings. All the catalogs only supply 3 ring pistons. The pistons and cylinders look good so I want to reuse them but I cant find any parts listing for 4 piston rings anywhere. Can any one help me locate a supplier? At the moment I dont know the manufacturer of the pistons. The engine was rebuilt...01-04-2022, 09:32 PM -
Pictured on the left is an old school Model A piston with an archaic design from the '20s, '30s, '40s.
On the right is a Model A piston of modern design, a design adapted by all car manufacturers many decades ago. The skirt is short and the rings narrow. Inspect the features of the two yourself; you need not be an engineer. You only need common sense to answer the following 3 questions:...07-23-2017, 07:48 PM -
Update for those who have helped with suggestions on my overheating problem:
I took the block and pistons into Portland Engine Rebuilders today and told them they needed to hone to .0045. I explained that it all seems to have come down to the issue of the sleeves not transferring heat like a simple bore of the block, combined with the already questionable water distribution in the block....07-13-2017, 11:54 PM -
im tearing an engine down, and it has ford .045" pistons with center lock wrist pins.my question is regarding the rings. The upper slot has a .012" spacer so it can use the same size ring as the middle slot. Yes, different size slots. The middle has one inch pieces stacked underneath the ring, so as to push the ring tighter to the cylinder wall. Whether these were originally one solid ring,...06-16-2017, 01:51 PM -
Narrow rings in IMHOP work better than wide rings. nWhat do you think.01-20-2018, 06:48 PM -
Is anyone currently making reasonable priced 283 pistons that fix standard length Model A rods?12-30-2020, 01:08 PM -
This post about Pete's Pistons has photos of the pistons that I just received from John. This is an excellent product and would fit perfectly with the new Burtz engine. I have been in touch with John Cosper of Pete’s Auto Machine in Albuquerque, New Mexico. He has in stock now 50 sets of 283 style standard sized pistons for standard length Model A rods. John had been selling his pistons under the...You do not have permission to view this gallery.
This gallery has 4 photos.04-25-2022, 11:17 AM -
I posted this on "another"forum in response to others and thought it might prove interesting on VFF
"I have a piston expander called a Koetherizer. Invented by Emil Koether in the Early 1930's. You clean the piston internally by blasting with walnut shells in the right hand chamber of the machine. Then insert the special squeeze bolt through the gudgeon holes, tighten the bolt...You do not have permission to view this gallery.
This gallery has 2 photos.03-07-2019, 04:45 AM -
a widow has an 1980’s set of .060” Ohio solid pistons. My question is, are they a good piston? Thanks.10-03-2018, 01:44 AM
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