Cam Impressions (5/10/2001)

I was change camshaft from GL spec to Mugen R1 replica.

(My old RS cam is worn very much. I couldn't get brand-new RS cam)

GL cam's torque range is 1500 - 4500 rpm in RS dual keihin CV carbs.

Engine can run over 6500 rpm, but not so good torque above 5000 rpm.

After that, I was change from RS carbs to Quad keihin CV carbs with Yoshimura's manifold.

The torque range is shift to high rev. ( 2800 - 6000 rpm ).

Above 4000 rpm, torque is little increased. I think this is Yoshimura's manifold character.

And then, I fit Mugen R1 cam.

Idle is a little bit lumpy, but it has good stability with quad carbs.

In below 1500 rpm, torque is little bit decreased.

In 2000 - 4000 rpm, torque is almost same as Gl cam.

Above 4000 rpm, there is rich torque until 6500 rpm.

I feel little valve surging over 6500 rpm in stock valve springs.

If I use RS dual CV carbs, I think torque range is 2500 - 7000 rpm with racing valve spring.

Now I don't increase comp. ratio yet.

If you increase C/R above 10:1, you can get more torque in low revs below 4000 rpm.

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