Originally Posted by beebone

Hi Grinder, do you think the clutch engagement point set to be earlier on small track with many corners? I know you normally set the engage point arpund 15,000rpm at your track, how do you define that engagement point.

Originally Posted by Grinder

I would adjust the engagement point to the level of grip. Usually on a small high grip track, I would use a strong clutch. On low grip, a softer clutch will limit wheelspin.

I have checked the shift point, and clutch engagement points with tachometers. Nova makes one that is very accurate. It's mechanical. I have also used audio tachometers over the years. They are not as accurate as the nova mechanical tachometer.

The use of a tachometer over the years has let me know what 6000, to 50,000 sounds like. You can also look at the tach exactly when it engages.

Originally Posted by ToysRUsKid

How does that Nova tach work? Do you connect it to the motor somehow? Understand the clutch has been one of the hardest things to learn and anything that can help is worth it to get.

Originally Posted by Highside20

Grinder,

Do you still modify Picco Torque .12? I did not see them in your normal inventory. What are your thoughts on this engine compared to your MM keep-on and RBM3.

Thanks!

Originally Posted by Grinder

My modified Picco Torque .12 makes comparable power to my other modified .12's. It's fast.

It is on my webpage. I must have been updating the site when you looked.

Originally Posted by Grinder

It has a rubber tip, that you push against the end of the crank. It catches the 2.5mm screw that holds the clutch on. It spins the tach, the exact rpm of the engine. It can also be used as an optical tach.

Originally Posted by Grinder

The M21, and XZR have similar power bands to each other after they are modified. The M21 has the edge on power over the XZR.

The M21, and XZR don't like to be run on the prop as long as some other engines. Heat the M21 up to 200F cover the head, and let it run on the prop at a low-medium rpm for no more than 500CC. Then put it in the car, gradually reach race tune over 5 to 10 tanks. The M21, and XZR are both much easier to break in than most engines.

A long, cold break in will damage the Picco M21 engine. Picco himself only runs a couple of tanks rich, then gradually reaches race tunes over the next few tanks.

The OS can be done the same way. I would not recommend this with most engine brands. Most engines need up to a .5 to 1 gallon of fuel, before you start leaning on them.

Originally Posted by Highside20

One last quick question. Do you recommend the picco 2669 or the nova 2660 with the picco torque .12?

Originally Posted by jensroland

Dear Grinder

Does this running in procedure also goes for the REDS M7T ... it's a Picco based engine, and I want to go after engines wich is easy to break in.

Best wishes; Jens

Originally Posted by ramspeed

Dear grinder , just finish run in your modify keep-on 21 really love the the low end power .the power worth every drop of nitro . I'm using 2015 pipe with the 5 fin manifold ,can I use Rb 2092 or 2018 with the short manifold will it be better?