Lotus Elan

711M Block

PostPost by: Will Grainger » Wed Jun 07, 2006 1:10 pm


Personally, I would always use high-end rod bolts. They're not that
much money and well worth it. Main bolts and caps should be fine as
is. I bored my 711M block out to 85mm and had no problems, but this
is pushing it. If I were to do it again, I would bore it out only as
far as necessary (like .020 or .030 over). The tiny bit of extra
displacement that is gained just isn't worth it. The standard rods
are plently beefy.

Good luck,

Will Grainger

2. things to think about when rebulding a 711m block for a twink
Posted by: "Timothy R Dafforn" ***@***.***forn
Date: Wed Jun 7, 2006 1:55 am (PDT)

Hi guys,

I am just begining to rebuild a 711m 1600 block to replace the L block
on my twink..

The reason for this is that as some of you have seen, the engine leaks
oil like the Exon Valdese and shows all the signs of needing a rebore.

Rather than have the car of the road engineless I have got hold of a
711m engine (still with standard sized bores) which I am going to

My question is, does anyone have any recomendations for things to do
while rebuilding the bottom end.

How far should I bore the engine out?

What type of pistons should I use?

Are the standard con-rods OK to use?

Should I use uprated bolts for the mains and con-rods?

Which oil pump?

Where should I get it prepared?

Any advice would be useful before I get into the heavy engineering bit

Just for information, the car is used as a daily drive and not as a


Will Grainger

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