sunbeam74
Silver Level Sponsor
I have been doing a bit of work to change to the chevy rods in the 1592 engine. There are some challenges but it seems it may work. Technically, the Chevy rod is closer to the 1592 rod than the 1725.
I was curious what some of the advantages might be in relation to weight. So, here are some details:
Stock rod: 726grams (up to as high as 740)
Rod from the Sports Car Forum Alpine: 534 grams with a lot of lightening work
Stock Chevy I6 rod - 560 grams (but I haven't weighed one myself - this information was via a catalog)
So, the Alpine rod could be just as light or lighter but it is a lot of work.
Now here are the technical challenges to fit a rod to the 1592 engine.
1) The bolt to bolt dimension of the big end of the chevy rod is larger than the cylinder. I think there are ways around this but it is challenging since the pistons can't be loaded from below.
2+3) Press fit wrist pin and the rod is .051" shorter
I probably will bush the little end of the chevy rod and go to a new wrist pin diameter with custom pistons which will account for the extra .051" of piston height.
I am a bit worried about the area around the oil pump. I remember Jarrid had issues with a Crower rod just missing the pump.
I was curious what some of the advantages might be in relation to weight. So, here are some details:
Stock rod: 726grams (up to as high as 740)
Rod from the Sports Car Forum Alpine: 534 grams with a lot of lightening work
Stock Chevy I6 rod - 560 grams (but I haven't weighed one myself - this information was via a catalog)
So, the Alpine rod could be just as light or lighter but it is a lot of work.
Now here are the technical challenges to fit a rod to the 1592 engine.
1) The bolt to bolt dimension of the big end of the chevy rod is larger than the cylinder. I think there are ways around this but it is challenging since the pistons can't be loaded from below.
2+3) Press fit wrist pin and the rod is .051" shorter
I probably will bush the little end of the chevy rod and go to a new wrist pin diameter with custom pistons which will account for the extra .051" of piston height.
I am a bit worried about the area around the oil pump. I remember Jarrid had issues with a Crower rod just missing the pump.