bn6
Junior Member
Once a BT-7 Owner, now a BN6 100/6 Owner
Posts: 89
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Post by bn6 on Dec 7, 2017 12:59:23 GMT
How can I identify the cylinder head from a 3000 Mk III engine, is it from the numbers in the casting on the manifold side of the head ? if so what numbers should I be looking for ? This is the cylinder head I am trying to identify, it has no AEC number but instead has what looks like 0380M7 cast in to it.
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Post by josefeckert on Dec 7, 2017 18:48:58 GMT
There is no special head for MK III engines. Its the same as for later MK 1s and MK IIs. The head on your pictures is a late 100/6 head. The 3000 heads have a "nose" (extension) close to the thermostat outlet. Otherwise there is not much difference to the late 100/6 head.
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bn6
Junior Member
Once a BT-7 Owner, now a BN6 100/6 Owner
Posts: 89
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Post by bn6 on Dec 7, 2017 19:12:57 GMT
There is no special head for MK III engines. Its the same as for later MK 1s and MK IIs. The head on your pictures is a late 100/6 head. The 3000 heads have a "nose" (extension) close to the thermostat outlet. Otherwise there is not much difference to the late 100/6 head. Thank you josefectert, are the combustion chambers all the same size from the late 100/6, and 3000 models to the end of production, apart from the camshaft change and BJ8 distributor change was wondering how they increased the BHP from early 3000 to the BJ8. The main question would be, if this is from a 100/6 I assume the engine would be a 2.6 Ltr engine, so would this head be any good on a 2.9 Ltr engine ?
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Post by josefeckert on Dec 7, 2017 21:19:47 GMT
Combustion chambers are the same, just very slight differences with the spark plug holes. Heads you can swap from 2.6 to 2.9 engines and vice versa, no problem. BHP was increased by different camshaft, distributor advance curve and carburetters. Mainly by the camshaft. Better to compare torque at lower revs and you see the difference is much smaller. For road use better to compare torque than BHP.
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bn6
Junior Member
Once a BT-7 Owner, now a BN6 100/6 Owner
Posts: 89
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Post by bn6 on Dec 7, 2017 21:24:20 GMT
Combustion chambers are the same, just very slight differences with the spark plug holes. Heads you can swap from 2.6 to 2.9 engines and vice versa, no problem. BHP was increased by different camshaft, distributor advance curve and carburetters. Mainly by the camshaft. Better to compare torque at lower revs and you see the difference is much smaller. For road use better to compare torque than BHP. That makes sense now thanks, as for the BJ8 camshaft would I expect to see a number to identify it as a BJ8 cam, say AEC865 ?
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Post by josefeckert on Dec 8, 2017 7:15:17 GMT
I don´t know the numbers. I always buy a new DWR1 cam when it comes to an engine rebuilt. Don´t like the hassle with old camshafts, regrinding, etc.
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Post by bbh on Dec 8, 2017 10:35:08 GMT
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bn6
Junior Member
Once a BT-7 Owner, now a BN6 100/6 Owner
Posts: 89
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Post by bn6 on Dec 8, 2017 11:41:42 GMT
Thanks bbh, I had already found that article regarding the AEC960 heads but what was really confusing me is the casting number on the head in the picture, 0380M7. Apparently though its a late 100/6 head and there is no real difference to the later heads fitted to all 3000's
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Post by josefeckert on Dec 8, 2017 18:57:59 GMT
bbh, in your mentioned article not all the truth is said. Static and dynamic advance is not only given by the head design. Also an important role plays the camshaft design, which is much more progressive with the BJ8 camshaft, which likes some more static and dynamic advance.
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