After stripping my GTD project engine and finding two bent rods I'm wondering how much boost the stock rods will handle?
Probably bent from the coolant pouring into your cylinders.
Quote from: libbydiesel on May 30, 2012, 10:11:51 pmProbably bent from the coolant pouring into your cylinders.or very bad valve contact..
Also stumbled across a thread claiming that the stock rods will take 290ft/lbs of torque without issue. They certainly look nice and strong but I'm used to petrol engine ones. I should imagine 20-25psi of boost is not a problem for them?
...BTW your Bieber avatar is awesome.-Malone
i ran north of 35psi (closer to 40psi) to a 1.5D engine, before the head let go..i tell you, the RODS are not the weak point. the head is. the bottom end will take whatever you throw at it.hell, i was making 20psi around 2500 revs the other day, ~half throttle or so.. and my engine still runs. they almost never see those kinda boost pressures down that low..my experience is with VNT turbos tho, and they make lots of boost down low.. conventional turbos usually run more restricted flow tho, so dont expect those numbers with a conventional turbo..so, again.. the HEAD is the weak point of IDI engines.. not the bottom end. the rods will compress anything that can be compressed..
When they bent, did you have to scrap the block, pistions, and rings, or did you just put new rods and rod bearings in the same bore and all was well? I have been thinking of upgrading rods, but money is money