Been reading up on the 188cid motors.

[Anlushac11]

I see now why they are so popular.

Take a 200's 3.68" bore block and drop in a 170's 2.95" stroke crank and use long rods and bore cylinders out by .060" (assuming block would support that) and you have a long rod 188 but with overbore now your pushing 194cid.

Some guys appear to be running a 5.4" long rod.

A shorter stroke meaning it should rev every bit as well as a 200, with a longer rod for good bore to rod ratio, and with overbore your only giving up 6 cubic inches.

I wonder what rpms these could run with the 7 main block, some main bearing cap straps and main studs, and a billet crank and some good aftermarket rods.

I have a picture somewhere of a Argie 188 that appears to have dry sump oiling, a lightweight flywheel, and some kind of mechanical crankcase evacuation system. I dont remember what fuel system it had.

 

[rbohm]

8) hmmm, and here i am considering building a 180ci engine based on a 170 with the 3.5" bore and a 3.126 crank from a 200. with a .060 overbore you get 186ci.

the only problem with the 5.4" rod is that you have a piston with a compression hieght of less than 1", and that makes the rings stack too tight.

 

[XFlow_Fairlane]

aussie 200 crossflow.....taller deck and can swap in a 250 crank if you want to later on.