Rb20 And Rb26 Rods

[legend01]

Hi Guys

found this intresting, while I have my engine pulled down to compare the rod's between the rb20 and rb26 since I've heard the rb26 rods are good for 650 hp stock what are the rb20 rods good for ????? .I've seen comparisons between the rb25 and 26 rods big differance there but to my surprise not a great deal in the rb20 apart from the big end and length but you decide check the pic's

these are just 2 differant views of rods rb20 rod on the bottom and on the left

these with the rb20 rod on top

these rb26 rod on top

side view

[Roy]

Good work. Do you have any pics of pistons side by side? Id likw to know if i can run an RB26 crank and rods with std RB20 pistons?

[legend01]

no rb26 but i got a set of rb25 pistons but I think you will have an issue with gudgen pin height

cheers peter

[carl h]

interesting...iirc the bearing width for the conrod bearings is what the main diffrence is between the 2.

[legend01]

It seems to be ,just the bigend 's are different the rb 20det one even seems a little bigger directly under the little end

Cheers Peter

[legend01]

And here's piston comparo for Roy , sorry not rb26 but a rb25 - 87mm piston up beside an rb20det 78.5mm piston

hope this might be of some help

Cheers Peter

[carl h]

are those std pistons next to one another, they look to be very simmilar, not sure bout pin hight tho.

[legend01]

the small one forged arias out my rb20, 78.5mm the second large one 87mm arias forged for rb25 the pin height is the same ring lans line up to there was just no way to get a piccy that showed this properly they were the best out of about 50 pic's i took trying to show the simialarities and size though now im debating weither to throw in the rb25 crank when i finish rebuilding my rb20 damn delema's

cheers Peter

[carl h]

hrmm, that would be a curious combo...rb20 pistons with rb25 crank.

would bring the motor closer to being square.