2 liter MG engine?

[PAUL161]

Read an article where it was said that someone was converting from an 1800cc to a 2000cc MG engine. I'm a little thrown off by this. I didn't know that you could cut out another 200ccs from an 1800, I thought you could only cut out another 100ccs. Anyone??

 

[Mickey Richaud]

Longer stroke?

 

[ecurie_ecosse]

The cylinders are overbored from standard 80.26mm to 83mm and fitted with Lotus Cortina pistons.This gives you approximately 1950cc.Of course if you live in the UK,you could trade in your 1800 for a 1950.Hap may be the person to put us on the right track here. :thumbsup:

Stuart.

 

[PAUL161]

Longer stroke?

I don't know Mickey, It might be possible using pistons with a shorter skirt. Like Stewart said, Hap could put his knowledge in here and possibly, (more than likely), give us the correct answer. Be interesting to hear what he has to say about it. Sounds to me like it would be a major modification to the block along with the crank as there isn't much room to work there. Curious. PJ

 

[Deleted member 8987]

Cut two cylinders off a 3-litre MGC?

 

[PAUL161]

Cut two cylinders off a 3-litre MGC?

I knew someone would come up with a good answer!

 

[Steve_S]

You can buy 2004cc MGB engines, and the Works department even pushed them to 2050 at one point.

 

[PAUL161]

You can buy 2004cc MGB engines, and the Works department even pushed them to 2050 at one point.

Where?

 

[Hap Waldrop]

Yep, it all bore size, MGB cylinders are aprox .375" thick so that leave a bunch of room for over bore, 1950CC is pretty popular, I'm dong 2 1900cc MGB motor right now (one of them is for my car), I like that size of overbore better, it allows you to still use the Payen/Felpro black head gasket. Here's the catch on this, over bore pistons triple in price. You no longer have to do the Cortina pistons deal, which were never cheap, which make you deck the crap out of the block, and has silly piston top design for the MGB, they now make 1900cc and 1950cc pistons made for the MGB.

 

[Steve_S]

Alden in the UK was selling 2004cc engines for years, and as far as I know they still are.

 

[PAUL161]

Yep, it all bore size, MGB cylinders are aprox .375" thick so that leave a bunch of room for over bore, 1950CC is pretty popular, I'm dong 2 1900cc MGB motor right now (one of them is for my car), I like that size of overbore better, it allows you to still use the Payen/Felpro black head gasket. Here's the catch on this, over bore pistons triple in price. You no longer have to do the Cortina pistons deal, which were never cheap, which make you deck the crap out of the block, and has silly piston top design for the MGB, they now make 1900cc and 1950cc pistons made for the MGB.

Hap, If I can ever get this TF done, I have two complete 1800 engines in the shed, a 72 and a 79 and might pull one of them out to re do. Would either one of these engines be a good candidate for building a 1900 or 1950 engine? Is one better than the other for this or are the blocks the same?
How about the cranks?

PJ

 

[Hap Waldrop]

Paul, The two I'm building right now are a 1967 18GB block and a 1979 18V block, either will work just on the later 18V blocks you need make sure it's not a factory sleeved block. As for the 5 main cranks my favorite is the steel flat side cranks which come in the say 69-70 until say mid 70s, but it does not matter much, any of the 5 main cranks will work in a street engine. If I had to pick, I'd say go with the 72 engine.

 

[PAUL161]

Paul, The two I'm building right now are a 1967 18GB block and a 1979 18V block, either will work just on the later 18V blocks you need make sure it's not a factory sleeved block. As for the 5 main cranks my favorite is the steel flat side cranks which come in the say 69-70 until say mid 70s, but it does not matter much, any of the 5 main cranks will work in a street engine. If I had to pick, I'd say go with the 72 engine.

Thanks Hap, The 72 has no issues and was a running engine when I put it to rest. It ran great so I'm assuming the head is good along with the block, not sure how the crank will check out, but it had good oil pressure and no abnormal noises. The 79 needs the head re done as it has a loose valve seat. The 72 is the one I'll use. Thanks again. PJ

 

[billspohn]

I've done a couple of these.

Most blocks will take an 83.5 mm bore, but not all, and the only way to tell if yours will is to sonic test it. I've had cylinder walls pinhole in a single shallow spot when doing a final hone - the rest of the wall was plenty thick but there was an inclusion on this one.

To go over 2000 you really need a longer stroke crank, which gives you a torquey motor that doesn't want to rev as easily - and isn't safe to rev as high. If you want a 2000, buy a Triumph!

 

[Hap Waldrop]

Even though I wnet with 1900 pistons here something to think about, as for piston cost and dispalcment

1950cc, pistons are in the 500+ range for set, and you need special head gasket, thats around .110: overbore

1900CC pistons are special order from the UK, no on here stock them and are in the $500+ for a set, but you can use the Payen black head gasket, which it by far the best MGB head gasket, this is why I chose this route, 1900cc is .080" overbore.

1875cc is .060" overbore and psitons are off the shelf for $175.00-250.00 a set.

As you can see it's a big jump in price in piston for the 1900 and 1950.

 

[elvacar]

Hap - Nice website - do the VTO's come narrow

and is that a Supra tranny behind the chromed B Series

Inquiring minds

I want to build up a 3 main B series for the Elva with an MGA tail section on the tranny - wanted to find a Westlake head for the B series - H Weslakes son is marketing the design for the A series

 

[elvacar]

I wonder if Weslake ever produced a head for the B series - the design is so similar - you'd have to think

 

[Hap Waldrop]

Hap - Nice website - do the VTO's come narrow

and is that a Supra tranny behind the chromed B Series

Inquiring minds

I want to build up a 3 main B series for the Elva with an MGA tail section on the tranny - wanted to find a Westlake head for the B series - H Weslakes son is marketing the design for the A series

What wheel size are you looking for?

The tranny bolted to the engine on my homepage (pictured below) is a Datsun 280ZX 5 speed, using a Rivergate conversion kit, the engine is a pretty high end tricked out 1800 with whole bunch of goodies for running the Moss SC at about 9 psi of boost.

 

[elvacar]

The Elva runs 15" 4.5" 3.9" backspace as the largest it can carry and keep the bodywork stock
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How much weight does the SC add

I want to stay period correct - which would leave me with a Judson - and the marvel mystery oil

A rare head would be the trick piece - mated with Twin Choke SU's

metal fused deposition modeling makes it all possible

Even Aluminum block B Series harboring triumph liners

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Side note - has anyone to your knowledge tried roller lifters

I saw an application where a plate or girdle was bolted to the gallery and the lifter body was relieved
to form a D section - the girdle plate kept the roller going straight

I know when we built up engines for racing we removed a lot of crap to keep inertial forces low - but that was the eighties.

 

[Hap Waldrop]

You have a Spridget bolt pattern (4x4) right? If so we keep some 15x6 +24mm Classic 8 in silver (4.5" backspacing) in the small center bore need to do the smaller bolt patterns like the Spitfires, TR7/8 and Spridgets gone wild, and few other cars. Sounds like we have too much offset for your Elva.

I have no idea what the Moss S/C weights, I never see that end of the deal in the shop, just the engine