Don Terrill’s Speed-Talk

CGT, I'm a big believer in good chambers. I also like as much quench area as possible, and quick burn chamber characteristics. I would like to keep costs down and not go to an aftermarket head solution. 3000-3200 cruise RPM does not have to be the 100% focus, but I would rather bias the efficiency i...

My 3.0 Merc has 100% flat to pistons. No valve reliefs. They are essentially 327 pistons, with no reliefs.

I think it's a 1989.

The valve angle precludes the need for the valve reliefs.

Mercruiser wants $180 per piston though...so I was looking to replace with 327 with minimal valve reliefs.

Looking to power a 24ft performance hull with a single engine. 475-500hp at flywheel is the target. Peak HP at 5500 to 5800. Cruise RPM 3000-3200. LQ4 would be the likely donor. 4.00" crank x 4.030" bore. 10.25:1 SCR area. Maybe push it to 10.75. Depends on cam. 317 heads ported (larger ch...

A lot of Diesel trucks up North in Alberta on the Oil Patch idle a lot. They have a very high engine on time to mileage. I bought one that was over 10k hrs with 500k kms. But the price was right. Some of the new heavy machinery is not designed to be idled all night, as some machines are in extreme c...

One of the issues with the traditional water flow through the block, heads, and coming together at the thermostat, is the flow regulation alternating from each head. As the heads compete for flow, with the higher pressure flowing until it lowers it's temp and pressure, while the opposite head has it...