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High compression engine?
Posted: Sun Jun 13, 2021 2:09 pm
by jagnut66
Hi,
In order to help get Elsie May up and running again I have acquired a spare engine.
Unfortunately the engine number ID plate is gone, so I can't just look for a 'H' or 'L' on that.
It has dished pistons, which I am given to understand from another post on here are an indication of a high compression engine block but are there any other things to look for?
Before I make the decision on whether to refurbish it I just want to make sure of what I have.
Best wishes,
Mike.
Re: High compression engine
Posted: Sun Jun 13, 2021 2:31 pm
by philthehill
Only the dish of the pistons dictate as to whether it is a high or low compression engine. All other parts are the same.
https://www.ebay.co.uk/itm/284179473896 ... SwAblgI7hO
https://www.ebay.co.uk/itm/304006016979 ... SwidxgqOWo
Re: High compression engine?
Posted: Sun Jun 13, 2021 2:35 pm
by jagnut66
Thanks Phil, I understand that Low compression engines had flat topped pistons, in which case the 'dishing' tells me it's worth investigating the state of this block further.
Best wishes,
Mike.
Re: High compression engine
Posted: Sun Jun 13, 2021 2:38 pm
by philthehill
Flat topped pistons indicate a high compression engine. Low compression engines had a deep dish.
See the two links in my post above to see the difference in dish.
Re: High compression engine?
Posted: Sun Jun 13, 2021 4:02 pm
by jagnut66
Ah, the post I read seemed to indicate the opposite.
I think from the above it is a HC engine however I think this is also one case where pictures tell a thousand words, so:
Re: High compression engine?
Posted: Sun Jun 13, 2021 4:07 pm
by jagnut66
- DSCF3867(1).JPG (430.83 KiB) Viewed 555 times
- DSCF3868(1).JPG (676.49 KiB) Viewed 555 times
There is staining on the bores but no ridges that I can tell.
I also don't know how long or where it was sat. The outside is 'cruddy' but nothing I can't clean up. The back waterways behind the drain tap are, as usual, silted up and will require flushing.
Next for me, if you concur this is a HC unit, will be to put my straight edge accross it and open up the sump and inspect the crank shaft etc.
Best wishes,
Mike.
Re: High compression engine?
Posted: Sun Jun 13, 2021 4:32 pm
by philthehill
The pictures above indicate to me that the engine is a high compression lump.
Re: High compression engine?
Posted: Sun Jun 13, 2021 4:41 pm
by jagnut66
Thanks Phil, I wanted to be sure.
The chap I got it off likes his vans (he has two nice ones), he therefore has a Low compression unit in the more original of the two.
He also has a spare rebuilt LC unit and would have a use for these.
I had to assume the person he got this off would know this.
Better for me to ask questions now, before I fit any new parts to it, an LC unit wouild be of no use to me.
Best wishes,
Mike.
Re: High compression engine?
Posted: Sun Jun 13, 2021 7:20 pm
by jagnut66
Well the engineers straight edge has revealed an uneven surface on the block, maybe head gasket failure is what took it out of whatever car it was fitted to in the first place.
So that means a complete strip for reskimming..........
oh, well............
Best wishes,
Mike.