I have a stock 97 JDM B18C-R Motor in my hatch with Toda Spec B's. Just did a compression and got the following low numbers: 195 195 195 199.

From the search i have done, these numbers seem awfully low for a Type R motor, but are atleast consistant.

Should there be any reason for concern? If so, what can cause low compression numbers eventhough they are consistant?

 

It's fine.

Warren

 

Did you get those numbers at wot

 

I did the compression test exactly as shown on the cspeed racing site.

http://www.c-speedracing.com/h...t.php

No one has any reasons why it is so low?

 

how many miles on the motor?

 

IF you did the test correct and the #'s are that close I would not worry about them being low.

 

Make sure the engine is up to opeating temp before you do the test. I didn't at first and my numbers were low. After some advice, I did the test again with the car warmed up and the numbers were right on the money.

 

I beleive the motor had about 50k km when i purchased it, so it should be close to that now as it is a race only vehicle.

Warming the car up can make that much of a difference? That's weird...

 

dont forget that the toda cams play into compression numbers as well, u are looking for consistency. Make sure car is at operating temp and at wot. Also if your valves need adjustement, it also plays a role in the numbers too, i gaind almost 15 psi when i adjusted my valves. I have the same motor as you, stock cams though and put down 270 across the board.