Post by account_disabled on Dec 23, 2017 11:31:19 GMT
Guys,
I had a couple of unusual phone calls this week, and I thought I would share them with you.
I had used a Hot Rods standard stroke/rod length crankshaft in my daughters RZ. It was very accurate, when I checked it on centers, before I installed it. The overall quality looked very high. So when I started to design my RZ engine, which I would like to be a stroked engine, I thought about Hot Rods 5mm longer rod/4mm stroke crank first. I'll give you the end of the story now, I'm still going to use the stroker Hot Rods crank. It's what happened in between that's funny.
Normally, when you install a stroker crank in any engine, you shorten the rod length by 1/2 the stroke increase, or you move the compression height up the piston 1/2 the stroke increase to allow for the extra movement. Most 4 cycle pistons will not allow you to move the pin bore up that much, because the ring pack is in the way. So I asked Hot Rods customer service what they did to allow for a 5mm longer rod, and a 4mm stroke increase, and how did this all effect the ports which were designed for the shorter stroke? The guy on the other end of the phone said that they had a special gasket kit that had a 3mm thicker BASE gasket, and a special Vertex piston and that would solve the problem.
So I asked Glen Curtis Yamaha in West Bend to order the gasket set to check it out. Well, the BASE gaskets are stock, and the HEAD gasket is a 5 layer MLS SS 3mm thick spacer. The guy at Hot Rods did not even know the difference between a head and base gasket! What they did was to allow the piston to come OUT of the bore 2mm or 0.080", and then try to take up this pop-out by making a real thick head gasket. A real bull-shit way of engineering an engine, and the head gasket spacer will only fit a Banshee, because of the different water passages.
Can anyone help me with this?
Thanks!
I didn't find the right solution from the Internet.
References:
www.2strokeworld.com/forum/index.php?topic=8204.0
Creative Medical Animation
I had a couple of unusual phone calls this week, and I thought I would share them with you.
I had used a Hot Rods standard stroke/rod length crankshaft in my daughters RZ. It was very accurate, when I checked it on centers, before I installed it. The overall quality looked very high. So when I started to design my RZ engine, which I would like to be a stroked engine, I thought about Hot Rods 5mm longer rod/4mm stroke crank first. I'll give you the end of the story now, I'm still going to use the stroker Hot Rods crank. It's what happened in between that's funny.
Normally, when you install a stroker crank in any engine, you shorten the rod length by 1/2 the stroke increase, or you move the compression height up the piston 1/2 the stroke increase to allow for the extra movement. Most 4 cycle pistons will not allow you to move the pin bore up that much, because the ring pack is in the way. So I asked Hot Rods customer service what they did to allow for a 5mm longer rod, and a 4mm stroke increase, and how did this all effect the ports which were designed for the shorter stroke? The guy on the other end of the phone said that they had a special gasket kit that had a 3mm thicker BASE gasket, and a special Vertex piston and that would solve the problem.
So I asked Glen Curtis Yamaha in West Bend to order the gasket set to check it out. Well, the BASE gaskets are stock, and the HEAD gasket is a 5 layer MLS SS 3mm thick spacer. The guy at Hot Rods did not even know the difference between a head and base gasket! What they did was to allow the piston to come OUT of the bore 2mm or 0.080", and then try to take up this pop-out by making a real thick head gasket. A real bull-shit way of engineering an engine, and the head gasket spacer will only fit a Banshee, because of the different water passages.
Can anyone help me with this?
Thanks!
I didn't find the right solution from the Internet.
References:
www.2strokeworld.com/forum/index.php?topic=8204.0
Creative Medical Animation