Re: Increasing top speed

Posted by Ken Sadler On 2012/3/31 3:16:33

I received the Tiny Tach yesterday so wired it up this morning to check the rpm.

Its possible to set the unit up in the range of 1 cylinder to 8 cylinders.

This is done by setting the angle from 360 degrees down to 45 degrees.

360 is for 1 spark per revolution
180 is 2 sparks
90 is 4 sparks
45 is 8 sparks

So I set it at 45 for the 8 cyliner motor.

Tickover speed reads at 250-300 rpm which seemed very low.

Checking the manual it refers to the load on the coil at 400rpm so I assume that this is the tickover speed.

I was expecting tickover to be more like 750 rpm

The tach works fine and reacts to increases in engine speed.

So the question is this; what is the normal tickover speed on this motor?

If I've set it up right and the engine runs at speeds as low as 250 then problem solved! My top speed issue is simply that I'm being too much of a pussy to open her up! Where I'm thinking its doing 3000rpm, its actually doing something like 1200-1400.

Advice gatefully received

Ken