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Old 31-12-2020, 22:05   #1
Fraggle13
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Engine health

Hello,

Iíve got an evo 7 with a forged engine. Itís probably done 1500miles since build.
Had pistons and rods at a company in wales, who Iíll never use again!!!
Itís always used a little oil but I never drove it often to really notice.
3-400miles to 1/2 litre. 10w50 Titan pro s.
Itís for wiseco 1400 pistons, gsc s2 274 cams etc.
Iíve done a compression test, hot with open throttle,
8 bar on all 4. With a couple of squirts of oil brings it up to 10.5bar.
It starts runs and drives ok.
I plan to do a leakage test once back at work.
The compressions seem low.
Whatís people thoughts? Anything to worry about?
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Old 31-12-2020, 22:21   #2
Humps85
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Drop in pistons ? 85mm bore ?
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Old 31-12-2020, 22:23   #3
Fraggle13
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Yes. Drop in 85mm.
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Old 31-12-2020, 23:24   #4
Mita
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An Indigo drop in isn’t ideal mate. But in truth drop ins are not a great route so I’m not surprised it’s using oil.
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Old 01-01-2021, 09:45   #5
plip1953
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The key point is that you're getting even readings across all cylinders. Did you do the test with a cold, warm or hot engine?

Doing a leakdown test is always going to be a good idea, so I would go ahead with that notwithstanding the consistency of pressure readings.
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Old 01-01-2021, 10:01   #6
McGoo60
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The original post says hot with open throttle.
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Old 01-01-2021, 11:29   #7
r3k1355
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Readings are a touch low but consistent, do a leakdown test and see what happens.

Should be alrite to keep driving till you've got the money together to have it apart again.
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Old 01-01-2021, 11:40   #8
Fraggle13
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Quote:
Originally Posted by r3k1355 View Post
Readings are a touch low but consistent, do a leakdown test and see what happens.

Should be alrite to keep driving till you've got the money together to have it apart again.
Thanks.

Iíve been thinking the same, as long as itís doing no more harm Iíll keep using it.
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Old 01-01-2021, 17:58   #9
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Do you know what oil was used when they fitted the pistons? Also did they do any mapping? I've had evos I've built go to gt and ended up over fuelling and glazing the bores. Usually upto .5ltr every 1k miles is acceptable.
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Old 01-01-2021, 18:24   #10
Mark Shead
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A drop in piston on a old bore Will always be a short life engine hence why I don’t carry them out.
Do it properly the first time and it will give you many years of fun.

Mark
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Old 01-01-2021, 19:36   #11
Fraggle13
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Quote:
Originally Posted by philip2 View Post
Do you know what oil was used when they fitted the pistons? Also did they do any mapping? I've had evos I've built go to gt and ended up over fuelling and glazing the bores. Usually upto .5ltr every 1k miles is acceptable.
There was only one oil on the invoice, the 10w50 Titan pro s.
Yes, they mapped it. Wasnít smooth. Car went back to them 3 times. I gave up and itís since gone elsewhere and had a link fitted and mapped.
It used oil since the build.
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Old 01-01-2021, 22:12   #12
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if they have used the titan s from the go, the rings wouldnt of had any chance of bedding in and with the map id put money on the map being too rich and that causing the cylinders to glaze to use that much oil. with compression being even, id just keep an eye on the oil if still using, if wanted price to re-ring etc drop a pm.
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Old 11-01-2021, 19:59   #13
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Any updates on this mate ? You thinking your gunna get it sorted ?
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Old 12-01-2021, 22:08   #14
Fraggle13
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Any updates on this mate ? You thinking your gunna get it sorted ?
After research it turns out drop in pistons donít fit and give an incorrect bore clearance.

Iíve been in talks with Norris designs who can supply pistons.

I plan to pull mine out and have a hone and measure.
Hopefully it wonít be damaged and need to pull it and rebore.

Just need to find the time.
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Old 13-01-2021, 07:20   #15
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Sounds promising mate, hope you get sorted and it doesnít break the bank.
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