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| Compression - I've had better days http://www.international2cvfriends.com/forum/viewtopic.php?f=7&t=5436 |
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| Author: | Diesel Dave [ October 25th, 2014, 4:06 pm ] |
| Post subject: | Compression - I've had better days |
Just finished futzing with the AK after a couple of days holidaying in the Malvern hills. The motor just doesn't perform as well as the old Acad. Checked the timing, spot on. Check the valve clearances - spot on. Check the compression... oops, one side 150psi and the other is down to 100, and these are supposed to be 9:1 pistons. I've re-torqued the head down and now it's up to 125psi I feeler a tear down is in order, or might just swap to the spare motor. What would you do - strip the current engine in situ, or swap the motor? |
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| Author: | subarupete [ October 25th, 2014, 4:51 pm ] |
| Post subject: | Re: Compression - I've had better days |
My 2psi Take the head off the low side and clean up the seating of the barrel at both ends. |
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| Author: | ken [ October 25th, 2014, 7:46 pm ] |
| Post subject: | Re: Compression - I've had better days |
The thing is, they're both low for 9.0:1 pistons, which should read more like 175 psi. Engine hot and throttle wide open, of course...  Bottom of the barrel? That sounds a rather novel idea. subarupete wrote: My 2psi Take the head off the low side and clean up the seating of the barrel at both ends. |
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| Author: | Sean [ October 25th, 2014, 10:49 pm ] |
| Post subject: | Re: Compression - I've had better days |
tappets can have quite a marked effect so make sure they are OK especially if the head studs have been re done. after that its usually scuffed bores |
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| Author: | ayjay [ October 26th, 2014, 3:26 am ] |
| Post subject: | Re: Compression - I've had better days |
might be a 2 stroke 
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| Author: | Diesel Dave [ November 7th, 2014, 7:19 pm ] |
| Post subject: | Re: Compression - I've had better days |
Just taken off the 2nd cylinder head from the spare motor in preparation..... When you find the stud is glued in with firegum...  I've had better days... 
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| Author: | subarupete [ November 7th, 2014, 7:30 pm ] |
| Post subject: | Re: Compression - I've had better days |
That's repairable, get it plug welded (alu). Drill and tap. |
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| Author: | Sean [ November 10th, 2014, 9:57 am ] |
| Post subject: | Re: Compression - I've had better days |
bolt and washer for the cheap bodge |
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| Author: | Diesel Dave [ November 10th, 2014, 11:39 am ] |
| Post subject: | Re: Compression - I've had better days |
Sean wrote: bolt and washer for the cheap bodge Sean I'm shocked; that level of bodgery shows a lifetime of practice. It's all welded up and all the M7 threads have been helicoiled for a bit of futreproofing. I'll post a piccie when I pick them up on Sat. |
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| Author: | Diesel Dave [ November 14th, 2014, 11:32 pm ] |
| Post subject: | Re: Compression - I've had better days |
All repaired   Now what's the weather forecast this weekend? |
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