Old Skool Ford Engine Only

[Moto]

Hi All. I'm going to come clean and say that my primary interest is in the 711M Crossflow engine and how to get the best from it. So apologies, as I don't actually own a complete Old Skool Ford car - just the engine & gearbox.  I believe the engine was originally from an Escort Mk1 Mexico which was rallied back in the 70's before being transplanted into my car.  

The spec is : 1760 cc, A2 cam, twin 40's with a 2000e semi close g/box.  Nothing special really but it is a lovely, lovely engine which I use for both road and competitive hillclimb events, often competing against Mk1 & 2 Escorts.  A beautiful Mk1 Twincam won last weekend at Loton Park - fantastic car.

I read most of the Crossflow related posts in the 'engine room' forum, so thx to all the contributors there.

Moto

 

[guido]

I do not know how to make a Kent crossflow to 1760cc. Is there such a long stroke crankshaft wich could make the capacity numbers? You can get as much as for limit on bore size, i think about 85 mm. But no further for rebuild? A2 cam, is old school but still a fine one to match the period days in time. However were are you within rev limits?

Edited August 31, 2025 by guido

[Moto]

85mm pistons gives 1760cc.  I'm running with Accralites now as I detonated a piston during a test day 7 years ago. There are plenty of people that don't recommend such large overbore but as it was done back in the early 80's, I guess the block is OK with it. It will rev to 6,500 but 6,200 is more than enough as the power is dropping over that.

[guido]

85mm on a standard stroke 1600? Bit thin on the line tho. I would not reccomend such overbore. Block gets weaker by that.

Cause this if need rebuild, it is over. Or re-sleeve block . I do not fancy a limit overbore anyhow. Just lil' less, at 1640 cc wich makes the

grunt as well as that overkill bore engine. for sure.  But ok, don' t rev it to much.

Edited August 31, 2025 by guido

[accord83]

@MotoI have a 1300 with a +90 bore 711M block, 1360 cc. BCF 3 Kent cam. Burton pistons, lightened and balance crank, rods, flywheel, rocker gear with spacers, 32/36 DGV Weber, big valve ported Mexico head, Harris air filter. Standard 1100 4 speed box and 3.9 axle, I like a short stroke revving engine. A bit too cammy in town, makes your ears bleed on a motorway, and likes spinning nearside dog dish hub caps off the 6J Weller steels, but a hoot on back roads. not fast but quick. When originally built we lived in the Yorkshire Dales and had a 1:6 hill one way, and a 1:5 the other, and the nearest motorway was 30 miles away. Built for is environs.