711 block

[badchild]

Whats the craic with the 711 block over the standard block? when i bought the avo i got the engine (16 xflow) that was in it and a spare and both are 711's and my mate very nearly shit the proverbial brick when he saw them, whats all the fuss about them? thanks

Ryan

[antz]

walls are thicker so they are better to bore out worth a few bob too cos they are getting rarer by the day.

 

keep them in the garage for a rainy day

[escort21]

Bigger and square main cap bearings ...the block to tune

[badchild]

Sweet! think ill be holdin on to them then! maybe tune 1 and keep 1 civilised

[escort21]

And bigger diameter cam followers

[antz]

i got one in my garage that i was gonna leg out until last week when i was told they worth summat

 

even though mines got a nice gouge in a bore itll go out a bit further but only with forged pistons.......itll be worth to someone one day

[Chris!]

i got one in my garage that i was gonna leg out until last week when i was told they worth summat

 

even though mines got a nice gouge in a bore itll go out a bit further but only with forged pistons.......itll be worth to someone one day

i sold mine for £25

[andypipe]

I thought 711 blocks were 2 a penny. Its the AX block that is sought after

[morcheen]

701m ones are rare too

[antz]

I thought 711 blocks were 2 a penny. Its the AX block that is sought after

 

 

true! but just think that as people want them for tuning they are going up in rpice and and people want them and as they get blown up, scrapped etc there are less around

 

the AX block is gold dust

[andypipe]

I thought 711 blocks were 2 a penny. Its the AX block that is sought after

 

 

true! but just think that as people want them for tuning they are going up in rpice and and people want them and as they get blown up, scrapped etc there are less around

 

the AX block is gold dust

 

And i have 2 711 and 1 AX

[tim]

I thought 711 blocks were 2 a penny. Its the AX block that is sought after

 

that what i thought,normally a few 711 blocks on ebay and in mag/papers for sale,loads in kit car mags

goin to south africa if u want an ax block

[fergus mk2]

what better about the ax block to the rest?????

[TomB]

Was the a relation with the T numbers on the side too????

[tim]

Was the a relation with the T numbers on the side too????

 

its ment to do with the thickness of the sidewalls so some people say

[Mr Sam]

some old tale that as the moulds were used and used the walls got thicker / thinner thats what the T's about

[Fiesta Steve]

There's nothing special about the 711m block, its just a bog standard x-flow block isn't it ?? Albeit slightly improved over the earlier version 681f.

 

So if you going to build a hot crossflow, you may as well use the later, better block.

 

They are getting a little harder to come across these days after years of being scrapped 'cos they are ten a penny. Its time we started saving them

[Toby]

I thought square main caps were the main benefits of a 711 over the early blocks.

 

There may be some truth in the T no. thicker block theory, but I've heard some low numbers have been really thick. Depends on the factory hand to turn the mould dial I guess. A measure up is the only way to be sure.

[hotrodholty]

I thought 711 blocks were 2 a penny. Its the AX block that is sought after

 

 

true! but just think that as people want them for tuning they are going up in rpice and and people want them and as they get blown up, scrapped etc there are less around

 

the AX block is gold dust

 

And i have 2 711 and 1 AX

now your just showing off. lucky bastard

if your my secret santa can i have your ax block. wrapped with a bow of course

[andypipe]

I thought 711 blocks were 2 a penny. Its the AX block that is sought after

 

 

true! but just think that as people want them for tuning they are going up in rpice and and people want them and as they get blown up, scrapped etc there are less around

 

the AX block is gold dust

 

And i have 2 711 and 1 AX

now your just showing off. lucky bastard

if your my secret santa can i have your ax block. wrapped with a bow of course

 

Sorry, thats being built up over the winter to go in the race car next season

[bronze4door]

so what the differance in a cross flow block and a lotus block

[escort21]

so what the differance in a cross flow block and a lotus block

 

The price ...talking about lotus stuff you can get a conversion kit to fit the lotus twin cam head onto a xflow, diff timing cover etc

[X FLOW EDDY]

so what the differance in a cross flow block and a lotus block

 

The lotus block has a big letter L stamped whare the engine mount bolts to the block .

[Toby]

so what the differance in a cross flow block and a lotus block

 

It's shorter and thicker walled than a 711. Hence why if you rebuild a lotus into a 711 you need a spacer above the front cover, and pistons with a taller compression height or longer rods.

 

I dont know, but I am fairly sure you're able to deck the 711 block down, I have heard of people (Dave with the blue anglia and fast pre-cross) decking the block and using the CF block with flat top pistons.

[V8ian]

711, 691, 681, All good reliable blocks, 711 had bigger mains and cam followers, The bigger mains dont seem to make a lot of difference to the strength of the engine, I know of plenty of non 711s that are reved beyond 8k on a regular basis,

However, the cam followers are an advantage, I had a couple of early engines with the small followers that broke up under severe duty,its worth boring the follower bores out to take the bigger followers,

T numbers, I will go with Toby on that, the T numbers are a casting box number, only there for fault tracing if a problem occours in production so they can track back the casting core and check it for defects, the bore thickness is down to inner core position and nothing else, the cores for the waterways are made probably from resin cured sand and are fitted into the main part of the casting box which is also filled with resin cured sand formed into the shape of the external dimansions, as you can immagine the sand in sand dimensions are only approx, and the tollerences are probably measured in 10ths of an inch, which is more than enough to give you enough core shift only to allow a 60+tho over bore, I have seen porous blocks at 20+tho, See I knew my Engineering apprenticeship in a large industrial Foundry would come in useful

 

Ian