Capri Technical Forum:

Hello peeps,
Could someone tell me why all the cossy conversions are BOA and not the BOB engine. Basically can it be done as I have come across a good engine. All I can find dimension wise is the BOB has shorter heads. Surely this is a good thing

There are a lot of minor changes to the BOB from the BOA.

The changes that you can see are not the problem.

The big problem is the management system

BOA is EECIV can be used with a manual box retaining exhaust and speed sensors.

BOB is EECV is major drama to use without the auto box - has exhaust sensors after catalysts - not realistic.
The answer is to use the BOA management - all you need is the ECU the rest can be sorted with a wiring diagram.

Other differences

BOA one double row chain runs all 4 cams
BOB two single row chains 1 each side

BOB slighty more power - different inlet and cams

Exhaust manifolds are different - not so easy to work with.

BOB block is stronger - might just be pub talk?

Thanks for clearing that up CSR. I had a Boa fall into my lap last weekend anyway which has put my mind at ease. It hasen't got a loom with it though. Do you guys make your own looms at caprisport?

("The answer is to use the BOA management - all you need is the ECU the rest can be sorted with a wiring diagram")

NO - you need a loom from a 24V Granada

csr wrote:
BOB block is stronger - might just be pub talk?

Not pub talk, they are stronger, more webbing in the crank area.

The BOB block was strengthened at the webbing to give something stronger then the BOA block that experienced crank problems when over rev'd,

BOB Block



BOA Block

It's not going to make any real difference to most people but at least
we now know that one is true.

Don't surpose you could find the BOA and BOB cams and compare them?