Eligibility Criteria for Drivers, Cars and the rules that govern them
Mon Dec 22, 2014 5:44 pm
Eric, feel free to give me a call sometime (or Ralph). The 5-main MGB engine is not legal in an MGA in VRG, even if it is sleeved down to the MGA displacement. MGA engines simply aren't that hard to find, they made over 100,000 MGA's and the same engine was used in many other BMC cars also. There are MGA engines on e-bay almost any day of the week, or in the classified section of the NAMGAR magazine. That's your best bet.
I will suggest, however, that you avoid using the MGA 1500 crankshaft -- it is notoriously weak. The 1600 (actually 1588) crank is a tiny bit stronger, but the 1622 crank is much better. You can retrofit a 1622 crank into a 1489 or 1588 block with a little machining, and I'll be happy to advise on how to do that (have done it many times). The 1800 3-main crankshaft is even stronger, but MUCH more work to retrofit into any MGA block, so it's simply not worth it in my opinion.
This may sound like blasphemy, but the numbers-matching designation for an MGA is really kind of silly. The engine number plate is stamped aluminum, riveted to the block, and is easily removed and transferred to another engine block. So who knows if a "numbers matching" MGA really is ...
Mon Dec 22, 2014 6:03 pm
Mark Palmer wrote: ...the numbers-matching designation for an MGA is really kind of silly.
Hey, I resemble that remark! <nyuk, nyuk, nyuk>
I understand about the easily replaced ID plate. But I
And my concern was not so much about saving it due to the originality of it but the reported fragility. This was a street car with over 300,000 miles on it before I re-restored it for vintage racing. My thought was that it might be cheaper to build a sleeved down MGB block/crank than beef up an MGA block/crank.
The 5-main MGB engine is not legal in an MGA in VRG...
Does that mean a 3-main MGB engine could be?
Tue Dec 23, 2014 3:31 pm
Eric -- why bother looking for a 3-main MGB engine (which is relatively rare and more expensive) when there are so many MGA engines to be had? It would cost more to sleeve the 1800 3-main, than to machine a 1500 or 1600 to take the 1622 crank.
Legend has it that 1622's are hard to find, but over the past year I have purchased three NOS 1622 crankshafts, two 1622 bare blocks, one 1622 short block and one complete 1622 engine. You just have to keep your eyes & ears open.
Don't overlook the possibility of sourcing a 1622 crank from England. They are more common over there, because of all the BMC saloon cars that used the 1622 engine in the home market. Shipping isn't cheap, but can be partly offset by a lower cost of the crankshaft. Look on e-bay UK, or contact the various MG parts suppliers located in England (Brown & Gammons, etc).
Tue Dec 23, 2014 11:38 pm
Mark Palmer wrote:You can retrofit a 1622 crank into a 1489 or 1588 block with a little machining, and I'll be happy to advise on how to do that...
I would appreciate that advice. And, for my edification, how to use an MGB crankshaft in an MGA block, too.
Wed Dec 24, 2014 2:31 pm
I would like this info also.... I have a 1500 in the shop for a rebuild, and I have a 1622 under a bench at home without a home.
Fri Dec 26, 2014 11:48 am
Eric & Randy -- will send you a private message in a few days, it's too detailed and probably too arcane to post on the Forum. We're traveling for the holidays but will get you the info when I return home.
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