I mean besides the prices, whats different about them?

 

http://rotary.a-spec.ca/

 

Here's a really short answer. The 13G is similar to the '85 and older engines. The 20B is similar to '86 and later engines. Your hint for today is the coolant seals' locations in the engines.

 

I see. I thought that the 13G's were also carbed whereas the 20B's were FI too. I just don't understand why the 13G's cost in excess of $15,000.

 

The 20B was produced in five (or so) batches of 1000 units each for a low production volume luxury car. In other words, it was sort of mass-produced. The 13G, on the other hand, was a racing engine and produced in much smaller numbers. Carbed or EFI doesn't really change the cost of a production engine, I wouldn't think. Again, the 13G had special and custom racing bits in each unti whereas the 20B shared parts with the S5 T2 13B. That's some cost savings right there.

You'd probably be better off going for a 20B if you ever decide to purchase a three rotor engine. There is more support (like the people of this 20B subforum) for one thing.

 

The 13G is a race engine. The 20B also comes as a non-turbo peripheral-port race engine, which sold for $42,000 when it was first produced. For comparison, just the parts for a NASCAR engine cost about $30,000. Race engines are expensive.

If you can find a complete long-block 13G in excellent shape for $15,000, you should buy it. That's a great deal for that engine, and it's a very rare collector's item.

 

Hi all.

We are building a few drift-FCs over here, and are thinking about using a 20B periperal port for one of them. (We have a few spare engines around).

My enginebuilder claims that anything over 8 K rpm, and the 20B is history (middle rotor wobble problem++). What are your thoughts about this?

The 13 G is claimed OK for about 9500 (?). What is the difference that make it take about 1500 rpm without problems over the 20B?

I know for a fact that the 20B can be balanced alot better than from factory, but if this is done, is there anyone who would push the 20B to lets say 9000 rpm?

I guess the power at 8000 rpm will be OK, but as always, it's nice to have the extra rpms for an even broader spread of power. It's not like the porting won't handle it :-)

Have a nice day.