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| Home > Help Needed / General Tech Chat > Daft question on boring out | |||||||
 3673 Posts Member #: 9300 Post Whore Quarry Bonk |
7th Sep, 2011 at 06:50:49pm
I know its okay to bore out +20 on a liner, what about +30? ive just picked up a set of +30 14cc dish pistons off Gav on rods for a silly not to price, which need new rings, but the block i have is a fresh 1275 linered block (was built up partially when i bought it) so its a debate as to whether i change the block or not.
On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!! 17.213 @ 71mph, 64bhp n/a (Old Engine) |
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 1648 Posts Member #: 9038 Post Whore Carlisle, Cumbria |
7th Sep, 2011 at 09:01:08pm
i think you can. My mate got a 1330 had it bored to 1380 basically and linered it back to 1275. And he said once those liners where out you can simply change them for a new set. Don't take my word for it, but im sure someone will be along with a proper answer soon. |
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 11046 Posts Member #: 965 Post Whore Preston On The Brook |
7th Sep, 2011 at 10:28:12pm
Four ring pistons require four rings. If they only needed three rings they would have only fitted three.
On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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3673 Posts Member #: 9300 Post Whore Quarry Bonk |
7th Sep, 2011 at 10:52:29pm
The pistons have TRW-175-9797-1 & JG(0/O not sure which) . 03 Stamped into the dish if anybody knows what these are, have a feeling they're std pistons from another car?
On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!! 17.213 @ 71mph, 64bhp n/a (Old Engine) |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
7th Sep, 2011 at 11:13:38pm
Google suggests thes are equivelant to AE 20395, and if you google that, all sorts of info can be found
Edited by Sprocket on 7th Sep, 2011. On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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3594 Posts Member #: 655 Post Whore Northern Ireland |
8th Sep, 2011 at 07:06:19pm
On 7th Sep, 2011 Sprocket said:
Four ring pistons require four rings. If they only needed three rings they would have only fitted three. four ring pistons are not exactly a performance piston. Finding rings for the +30's is not easy, but you should be able to get hold of them if your machine shop know where to shop. Dont really see why they would require 4. If you can source rings that fit correctly, and there are 2 compression sealing rings and an oil control ring. Whilst it would probably be seen as bad practice, the normal 3 rings would work just fine. Whilst not comparable, F1 engines only have a single ring on each piston apparently 9.85 @ 145mph
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3673 Posts Member #: 9300 Post Whore Quarry Bonk |
8th Sep, 2011 at 07:33:29pm
Would it just require a set of rings to suit +30s? Or do i need to find out what pistons these are? Either way if i can get rings im going to give the pistons a go, can't see why they'd not be any good and it saves me a few quid in the longrun. On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!! 17.213 @ 71mph, 64bhp n/a (Old Engine) |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
8th Sep, 2011 at 08:00:30pm
On 8th Sep, 2011 stevieturbo said:
On 7th Sep, 2011 Sprocket said:
Four ring pistons require four rings. If they only needed three rings they would have only fitted three. four ring pistons are not exactly a performance piston. Finding rings for the +30's is not easy, but you should be able to get hold of them if your machine shop know where to shop. Dont really see why they would require 4. If you can source rings that fit correctly, and there are 2 compression sealing rings and an oil control ring. Whilst it would probably be seen as bad practice, the normal 3 rings would work just fine. Whilst not comparable, F1 engines only have a single ring on each piston apparently Some bike engines have only two rings, one compression and one scraper. Does that mean I could remove a ring from a three ring piston? But then which ring would I remove? While I see your point, why, if they were designed for four rings, why would you want to just fit three rings? I have no doubt that it would work perfectly well, but what un foreseen probems might there be, and why did the manufacturer fit four rings in the first instance? I'm pretty sure they would have fitted only three if they never needed the fourth, but perhaps you can see something that they never? Maybe its the quality of the ring materials, with modern materials creating a better seal, but then if you are looking for a ring pack for an old obsolite piston, the rings you find will likely be of the same old material thus requiring that extra ring? I don't really know, don't really care, since the friction from a four ring piston is what puts it in the 'non performance' catagory. You cannot just fit any ring set, it needs to be the right ring set for the piston. Rings have dimension, and that dimension can vary from one piston to another, and obviously, if the rings you find are a different dimension to the grooves in the piston, they'll either be slack as Nora Batty's stockings or just simply not fit in the groove at all. Get the right rings for the job. Its not difficult I suggest you have a look on Bradford Grinders website for rings 
On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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3673 Posts Member #: 9300 Post Whore Quarry Bonk |
8th Sep, 2011 at 08:13:39pm
Obviously the question on 3 rings would be aftermarket versions, if there are any.
Edited by Carlzilla on 8th Sep, 2011. On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!! 17.213 @ 71mph, 64bhp n/a (Old Engine) |
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3673 Posts Member #: 9300 Post Whore Quarry Bonk |
8th Sep, 2011 at 08:28:23pm
I think i have these to narrow down if im on the right track:
On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!! 17.213 @ 71mph, 64bhp n/a (Old Engine) |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
8th Sep, 2011 at 08:37:10pm
http://www.minimaniauk.co.uk/web/Item/R203...0/InvDetail.cfm
On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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3673 Posts Member #: 9300 Post Whore Quarry Bonk |
8th Sep, 2011 at 08:47:23pm
Cheers Colin. Im probably best ordering them off minimania as im guessing ill get bummed for import duty or something if i get those off ebay?
On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!! 17.213 @ 71mph, 64bhp n/a (Old Engine) |
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 7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
8th Sep, 2011 at 09:30:34pm
Getting .30 rings is easy. Get some .40s and grind them down. On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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