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1098 pistons

Posted by Adam Morris

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1098 pistons #1
Adam Morris Renton, Washington, USA 1955 Chevrolet Silverado 1961 MG Midget MkI 1965 Chevrolet Corvair	Posted: September 13, 2012 02:38PM Registered: 10 months ago Posts: 258

i have an early 1098 CC engine i was in the process of rebuilding because the #3 piston skirt broke. even though this engine ran good and had good compression (140-145) i decided to remove all the pistons and measure the cylinders while i had it apart. i found .014" variance in 2 of the cylinders. this is bad news because i just bought a standard bore piston from someone on this site in the hopes of just sliding in a non broken piston. so anyway, its going to the machine shop. what are my options for pistons? preferably 3 or 4 rings with holes instead of the large slots that the stock ones have. thanks in advance. btw its gonna be bored .030" or 040" over stock.

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Re: 1098 pistons #2
mjamgb michael anderson NORTHERN NEVADA, USA 1954 MG Magnette ZA 1967 MG MGB 1973 MG MGB 1974 MG Midget	Posted: September 13, 2012 04:38PM Registered: 4 years ago Posts: 6,403

20, 30, 40 and 60 thou all available through normal channels. Dunno the configuration but I suspect a quick phone call will yield an answer.

I understand from my machine shop that they dislike going up more than one oversize at a time because it requires them to overbore it twice or three times instead of once (cost you more $$). So if you take it to your favorite shop, have it checked and have the size they say it needs direct shipped you will be $$ ahead (typically they want the pistons in hand for the final hone to size).

Does the piston design really matter for a basically stock rebuild?

If you REALLY care, PM Hap Waldorp as I suspect he's seen more of these in his career than you can imagine.

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Re: 1098 pistons #3
Adam Morris Renton, Washington, USA 1955 Chevrolet Silverado 1961 MG Midget MkI 1965 Chevrolet Corvair	Posted: September 13, 2012 05:40PM Registered: 10 months ago Posts: 258

In reply to # 2169308 by mjamgb 20, 30, 40 and 60 thou all available through normal channels. Dunno the configuration but I suspect a quick phone call will yield an answer.

I understand from my machine shop that they dislike going up more than one oversize at a time because it requires them to overbore it twice or three times instead of once (cost you more $$). So if you take it to your favorite shop, have it checked and have the size they say it needs direct shipped you will be $$ ahead (typically they want the pistons in hand for the final hone to size).

Does the piston design really matter for a basically stock rebuild?

If you REALLY care, PM Hap Waldorp as I suspect he's seen more of these in his career than you can imagine.

its got a cooper s cam and a 12G206 head ported with 1.31" intake and 1.15" exhaust valves so its not completely stock. i have to buy a set of pistons and i'd like to intall some that are more durable than the stock units. the machine shop im using for this does all the machine work for the shop im in so he'll give me a deal on the boring.

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Re: 1098 pistons #4
kirks-auto robert kirk Davenport, Iowa, Rock Island, Illinois, Clearwater, USA	Posted: September 13, 2012 09:56PM Registered: 4 years ago Posts: 13,159

Adam,
Send me an email of PM if your choose. There is no piston made I can find and offer you. I also agree with Mikey "THE AXE MAN"...if possible go only one size up...0.020 overbore. Otherwise you are wasting the block while not really increasing compression to a significant level. IMHO, FWIW and FYI

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Re: 1098 pistons #5
pixelsmithusa Gerard C San Francisco, USA 1946 Austin 10 1960 Austin-Healey Sprite Bugeye 1960 Morris Minor 1000 Pickup 1960 Morris Minor 1000 Saloon (2-door) 1964 Morris Minor 1000 Saloon (4-door) → more	Posted: September 14, 2012 02:42AM Registered: 2 years ago Posts: 805

In reply to # 2169198 by Adam Morris i have an early 1098 CC engine i was in the process of rebuilding ...

...preferably 3 or 4 rings with holes instead of the large slots that the stock ones have. thanks in advance. btw its gonna be bored .030" or 040" over stock.

There are 4 and 5 ring pistons available for 1098's. (8:1 and 9:1) AE makes a 4 ring, but I've not seen a 3 ring for a 1098 before, so not sure if that's a possibility. Sizes usually run standard, .020, .030, .040, .060. Oversize depends on how much bore taper you have, but probably best to use a higher compression piston rather than go bigger than necessary.

Gerard

http://gerardsgarage.com/

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Re: 1098 pistons #6
kirks-auto robert kirk Davenport, Iowa, Rock Island, Illinois, Clearwater, USA	Posted: September 14, 2012 03:57AM Registered: 4 years ago Posts: 13,159

x2 Gerard

The County copies of OEM Hepolite are available only in 5 ring 8.9:1 compression. Not to dispute, but my and most others primary supplier oddly don't list AE but I haven't gone further for the moment. Typicaly one can discard the bottom ring in 5 ring set ups with no foul nor harm. I too know of no common set with 3 rings only.

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Re: 1098 pistons #7
Speedracer Hap Waldrop Greenville, SC, USA 1967 MG MGB "The Biscuit"	Posted: September 14, 2012 06:44AM Registered: 7 years ago Posts: 20,590

There are County 4 ring pistons, for the 8 to 1 piston, the the 9 to 1 piston is 5 ring , go figure, the AE piston is a 4 ring design. Powermax did make a 3 ring piston for the 1098 many years ago, they were flat top pistons and they would rework them to dome pistons. I have a friend that covets 1098 stuff,. he may have a set of NOS lying around, PM me and I'll give you his contact info.

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Re: 1098 pistons #8
Adam Morris Renton, Washington, USA 1955 Chevrolet Silverado 1961 MG Midget MkI 1965 Chevrolet Corvair	Posted: September 14, 2012 07:28AM Registered: 10 months ago Posts: 258

thanks for the input. i may just go with the 5 ring 9 to 1 pistons. the skirt likely broke because of the amount of taper in these cylinders. the machinist called last nite and said he measured .020" taper on #3. so i feel that with a proper rebuild the stock style pistons will hold up fine. im not gonna be reving this thing like a race motor after all.

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Re: 1098 pistons #9
Macksprite68 James McKenzie Lawrence KS, USA	Posted: September 14, 2012 07:32AM Registered: 1 year ago Posts: 111

I put AE pistons in my 1275 when rebuilt 2 years ago. I tried to do a lot research on pistons before the build, there are lots of brands and kinds of pistons available. I wanted something that had some kind of track record (pun intended), not wanting some off the shelf kind made in some country in South America that I had never heard of before. Also I agree with Robert, 0.20 would be the way to go.
James

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Re: 1098 pistons #10
PeterC Peter Caldwell Madison Wisconsin, USA	Posted: September 14, 2012 09:57AM Registered: 7 years ago Posts: 2,185

History. AE # 16170 was a 3 ring piston for 1098s.

I have 1 STD NOS one.

16179 was a 5 ring replacement.

Peter C

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Re: 1098 pistons #11
kirks-auto robert kirk Davenport, Iowa, Rock Island, Illinois, Clearwater, USA	Posted: September 14, 2012 10:49AM Registered: 4 years ago Posts: 13,159

0.020 or possibly 0.030 depending on what the machinist can clean up on #3. 0.020 taper is somewhat dramatic and a real ponder if the other 3 don't have something close to that.

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Robert Kirk
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Re: 1098 pistons #12
Adam Morris Renton, Washington, USA 1955 Chevrolet Silverado 1961 MG Midget MkI 1965 Chevrolet Corvair	Posted: September 14, 2012 11:36AM Registered: 10 months ago Posts: 258

its possible that part of the skirt had been broken off for some time and it caused excessive rocking in the #3 cylinder bore. the others were between .009"-.015" per the machine shop. there were only 4 rings on each piston, the bottom rings were not installed when i pulled it apart. someone obviously had this thing apart at some point. the main and rod bearings weren't to bad, the oil clearances were just on the edge of being in spec. the crank is at the machine shop as well btw.

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Re: 1098 pistons #13
Speedracer Hap Waldrop Greenville, SC, USA 1967 MG MGB "The Biscuit"	Posted: September 15, 2012 06:42AM Registered: 7 years ago Posts: 20,590

In reply to # 2169752 by Macksprite68 I put AE pistons in my 1275 when rebuilt 2 years ago. I tried to do a lot research on pistons before the build, there are lots of brands and kinds of pistons available. I wanted something that had some kind of track record (pun intended), not wanting some off the shelf kind made in some country in South America that I had never heard of before. Also I agree with Robert, 0.20 would be the way to go.
James

James, it's not like their are many choices, bascily there are only two "off the shelf" piston manufactuers for our engines, AE and County these days, County (XRN) is the largest manufactuer of our car's parts, in many cases they are the only people to make certain parts for our cars. I use County these days more so than AE for pistons, because County has better ring sets than AE, AE has that silly cast oil control ring on their 1275 pistons, other than that, the pistons are near identical.

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Edited 2 time(s). Last edit at 09/15/2012 06:45AM by Speedracer.

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Re: 1098 pistons #14
kirks-auto robert kirk Davenport, Iowa, Rock Island, Illinois, Clearwater, USA	Posted: September 15, 2012 06:44AM Registered: 4 years ago Posts: 13,159

Ironically, County buy many of there rings here in the USA. thumbs up

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Robert Kirk
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Re: 1098 pistons #15
Speedracer Hap Waldrop Greenville, SC, USA 1967 MG MGB "The Biscuit"	Posted: September 15, 2012 06:47AM Registered: 7 years ago Posts: 20,590

In reply to # 2170649 by kirks-auto Ironically, County buy many of there rings here in the USA. thumbs up

Yes, Grant rings, very good quailty. Although, I would love to see more oil control ring expander like the one Hastings uses, becuase it is impossible for them to ever be overlapped during assembly, when I get rings from Total seal for the Performance and race engines, I always get Hastings oil control rings, alot of peopel may not know this, but TS does not make rings, just modify existing rings to be gapless.

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Edited 1 time(s). Last edit at 09/15/2012 06:51AM by Speedracer.

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Re: 1098 pistons #16
Adam Morris Renton, Washington, USA 1955 Chevrolet Silverado 1961 MG Midget MkI 1965 Chevrolet Corvair	Posted: September 15, 2012 08:09AM Registered: 10 months ago Posts: 258

i found some flat top pistons with 3 rings and a solid skirt. http://www.minimotors.com/Mini_Cooper_Parts_and_Accessories.cfm?pn=RE-A1119-40&pID=165010

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Re: 1098 pistons #17
kirks-auto robert kirk Davenport, Iowa, Rock Island, Illinois, Clearwater, USA	Posted: September 15, 2012 08:20AM Registered: 4 years ago Posts: 13,159

You can certainly buy where you wish but that is no great shakes deal IMHO. Moss retail is $245 and while they don't show 40 over I am pretty sure some of the better vendors wupporting this site have or can get them. Why the urgency to bore bigger when smaller might appear to work?

Regards,
Robert Kirk
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563 323 1017
Moss distributor UK importer
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Re: 1098 pistons #18
Speedracer Hap Waldrop Greenville, SC, USA 1967 MG MGB "The Biscuit"	Posted: September 15, 2012 04:12PM Registered: 7 years ago Posts: 20,590

Why is it that vendors pop up with a website and put no phone number on their site, are they hermits, or what. I would be leary of people that make themselves so hard to get in touch with. Minimania has them too, their price is little higher, but they will answer the phone if needed. Sorry for my rant, but I would like to see everyone of these .com idiots that will not put up a phone number on their website, go up in flames. They are not part of our community, they are simply retail ecommerce whores.

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Re: 1098 pistons #19
Adam Morris Renton, Washington, USA 1955 Chevrolet Silverado 1961 MG Midget MkI 1965 Chevrolet Corvair	Posted: September 15, 2012 04:17PM Registered: 10 months ago Posts: 258

In reply to # 2170960 by Speedracer Why is it that vendors pop up with a website and put no phone number on their site, are they hermits, or what. I would be leary of people that make themselves so hard to get in touch with. Minimania has them too, their price is little higher, but they will answer the phone if needed. Sorry for my rant, but I would like to see everyone of these .com idiots that will not put up a phone number on their website, go up in flames. They are not part of our community, they are simply retail ecommerce whores.

they use all the same pics as minimania too. i would not order anything from them. very shady imo. they popped up in a google search after i found those pistons listed on minimania.

if i put flat tops in my engine with 27cc combustion chambers what will my compression ratio be? 8.9 to 1 with the dished pistons and 28cc combustion chambers

Edited 2 time(s). Last edit at 09/15/2012 04:22PM by Adam Morris.

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Re: 1098 pistons #20
Speedracer Hap Waldrop Greenville, SC, USA 1967 MG MGB "The Biscuit"	Posted: September 15, 2012 04:26PM Registered: 7 years ago Posts: 20,590

Yeah, see the 1098 was way more popular in the UK in the Mini market, than it ever was here in the Spridget market, so searching Mini sites will net you more choices.

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