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Post by sundowner on Jan 16, 2024 13:07:59 GMT 1
Hello
Ive just done a compression test on my 350lc.
It came out with 75 P.S.I each barrel.
This seems a good bit low to me that.
What do you think it should be sat at.
Thanks.
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Post by element137 on Jan 16, 2024 13:18:00 GMT 1
Seems on the low side, my YPVS after standing close on 10 years and before a complete rebuild was knocking out about 125psi each pot, there will be people on here with way more experience than me to say where it should be , but 75 seems low.
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Post by abar121 on Jan 16, 2024 13:57:49 GMT 1
Throttle wide open?
On my cheapo gauge, 90 psi or lower is rebuild time. Freshly rebuilt is around 120psi.
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Post by sundowner on Jan 16, 2024 14:06:04 GMT 1
Yes warmed up then kicked over with throttle wide open.
Looking like engine out and barrels off for inspection
Then probably looking for a rebore in North yorkshire somewhere
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Post by shaunthe2nd on Jan 16, 2024 16:29:17 GMT 1
Yes warmed up then kicked over with throttle wide open. Looking like engine out and barrels off for inspection Then probably looking for a rebore in North yorkshire somewhere Muttsnuts territory! |
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Post by midlifecrisisrd on Jan 16, 2024 17:20:54 GMT 1
What shaun said
Mutts did an LC set for me last week
Steve
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Post by muttsnuts on Jan 16, 2024 19:09:40 GMT 1
yep, I do rebores, based in Wetherby - LS23 7FL
75psi is very low, I am surpried it started TBH
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Post by crogthomas on Jan 17, 2024 9:58:43 GMT 1
How many times do people kick the engine over before taking a reading?
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Post by linx on Jan 17, 2024 11:48:16 GMT 1
Until the gauge stops going up.
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Post by chrisg on Jan 17, 2024 11:50:18 GMT 1
A double check would be to put a bit of 2t down the bores and if the reading goes up, then probably the cylinders are fooked.
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Post by sundowner on Jan 17, 2024 12:16:40 GMT 1
Yes just put oil in bores, one side went up up 80 the other 100 psi. New rebore required me thinks.
Engine out today.
See what it looks like.
Mothered i would imagine.
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Post by chrisg on Jan 17, 2024 12:52:45 GMT 1
Search re bores on here for info', places to go etc...
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Post by sundowner on Jan 17, 2024 17:35:34 GMT 1
Engine out ,barrels off.
Not good news, one side has lost the circlip out and badly scored the barrel the other one is worn.
Not sure if it will stand a rebore as scoring is bad. Piston has 25 on it not .25.
I cant seem to add pics.
Can these barrels be re sleeved any suggestions.
Thanks
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Post by chrisg on Jan 17, 2024 17:42:24 GMT 1
Try to get some pics on here.
Re sleve is an option. PJME do them, not sure of the wait.
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Post by Gitram on Jan 17, 2024 17:42:40 GMT 1
measure it with a verynear caliper just to check.. Muttsnuts, PJME and Grampian motors will advise if you give them a call
marti
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Post by dusty350 on Jan 17, 2024 17:51:30 GMT 1
Paul at Pjme is a member on here.
He did an awesome job resleeving my 350 barrels. There is a thread in the resto section if you want to see what's involved
🙂
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Post by midlifecrisisrd on Jan 17, 2024 18:16:27 GMT 1
Engine out ,barrels off. Not good news, one side has lost the circlip out and badly scored the barrel the other one is worn. Not sure if it will stand a rebore as scoring is bad. Piston has 25 on it not .25. I cant seem to add pics. Can these barrels be re sleeved any suggestions. Thanks 25 marked on the piston is 0.25 over size If it was 2.5 over it would say 250 on the top Circlip damage is usually deep. Given that the barrels can go to 2mm over and is on .25 gives a max diameter increase of 1.75 so if the score is 1mm they are shagged Personally given the availability of 250 barrels I'd buy another pair. Only getting them measured will tell for sure Steve |
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Post by sundowner on Jan 17, 2024 18:25:11 GMT 1
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Post by midlifecrisisrd on Jan 17, 2024 19:19:04 GMT 1
Which side is scored?
Steve
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Post by muttsnuts on Jan 17, 2024 19:42:23 GMT 1
that will probably clean up, if your close to me, pop in and I'll measure/check them for you
Also, I'll be doing resleeving very shortly, now that I've sorted out a few things.......
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Post by sundowner on Jan 17, 2024 19:48:24 GMT 1
The left hand side is scored
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Post by midlifecrisisrd on Jan 17, 2024 21:34:54 GMT 1
The left hand side is scored There are a couple of cheap low bore left barrels on ebay Steve |
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Post by sundowner on Jan 18, 2024 12:46:04 GMT 1
The liners look very thin?  ??   |
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Post by midlifecrisisrd on Jan 18, 2024 13:04:22 GMT 1
I'm getting mixed up between compression problem threads, thought yours was 250 but obviously 350 now I see them
If the bore is central in the liner 2.5 over is possible
With the rarity of 350 barrels I'd be getting that measured to see if you can get some more life out of it
Steve
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Post by midlifecrisisrd on Jan 18, 2024 13:06:13 GMT 1
Also looks like your measurements are wrong unless the are so worn you can fit a 64.25 piston in what was a 64mm bore
Piston looks like a ypvs one too
Steve
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chippy348
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Posts: 276 
Member is Online
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Post by chippy348 on Jan 18, 2024 20:01:34 GMT 1
The liners look very thin? ?? A few points, The groove down the side of the bore has been made by the G-pin coming out of the piston, so either someone has forgot to put a C-clip in or it has come out. I think you are not measuring them correctly, my guess they are at worn 64.25mm The sleeve looks thin as someone has been porting them and chamfered edge to make it look thin. They will 100% need a bore BUT not sure what they will end up at due to the groove the G-pin has made, my guess they will end up on +1.50mm Hope that helps |
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Post by sundowner on Feb 4, 2024 15:00:21 GMT 1
Ive had it re-bored at mutts nutts 1.25 oversize.
Top job and service from Dave, a top bloke and ever helpful.
Just need to get it put back together next week.
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