Re: FX Holden Race Car Project
Posted: Thu Apr 14, 2022 12:18 pm
Have you looked at the king spring catalogue? as that spring is a king spring in the pic
Electronic Fuel Injection - Developement & Tuning
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vlad01 wrote:Holly shitballs!
I feel like there must have been a cause of loss of lubrication. I have not heard the old Holden 6 have too much issues with oil in high strung applications, so I think a complete teardown is in order to see if there is any causes.
You didn't happen to log oil pressure? Not that oil pressure is a reliable indication such as ecotecs where full pressure can be fine and loss of lubrication happens anyway due to the common cam bearing blocking the mains. But at least that can help eliminate air being drawn by the pickup.
Holden202T wrote:@vlad - i have done a complete tear down, the block is empty. The only things i can find wrong are the fucked cylinder and some bearing wear on a few of the mains as well as the #6 rod end.
I have always been concerned with oil in this engine after my oil pressure gauge was going to zero on the dyno (almost zero by 4000rpm up to redline). i figured thought if it actually was it probably would have failed on the dyno, so i installed a oil pressure sensor into the data logger, it never went below 30psi in the logs. (so probably a bit low for safety!)
BUT .... the oil goes into the block around cylinder 4, then there is a main gallery running along the motor beside the lifters, which provides oil to them and also down to all the main bearings, then the mains feed the cam & rods, from what i understand too, the mains 1, 3, 5 have a second hole in them to feel oil to the cam bearings.
so 1 & 6 are not only at the ends of the engine (and the oil system), but 1 at least is also shared with a cam bearing, so potentially there is just not enough going to it. I've found a bit of info since which says to drill out a few passages in the block, namely the one from the pump to the main gallery, and then also to enlarge the passages going to the mains that feed cams also, so this all makes sense, hopefully between that and bumping the pressure up will solve the issue.
the only other thing i did wonder about is the external oil pickup i have, i did wonder if maybe i had it too close to the sump floor, but i have confirmed since stripping the motor that i can actually just fit my finger under it, so that should be plenty enough of a gap allow sufficient oil into it - i did also wonder about oil slosh on launch, but i saw this issue on the dyno so that rules out g-forces.
@heff - yeah very lucky i didnt take out the cam or hurt the head thats for sure!
Interesting, did you ever find a part number for it?Holden202T wrote:@vlad - i have done a complete tear down, the block is empty. The only things i can find wrong are the fucked cylinder and some bearing wear on a few of the mains as well as the #6 rod end.
I have always been concerned with oil in this engine after my oil pressure gauge was going to zero on the dyno (almost zero by 4000rpm up to redline). i figured thought if it actually was it probably would have failed on the dyno, so i installed a oil pressure sensor into the data logger, it never went below 30psi in the logs. (so probably a bit low for safety!)
BUT .... the oil goes into the block around cylinder 4, then there is a main gallery running along the motor beside the lifters, which provides oil to them and also down to all the main bearings, then the mains feed the cam & rods, from what i understand too, the mains 1, 3, 5 have a second hole in them to feel oil to the cam bearings.
so 1 & 6 are not only at the ends of the engine (and the oil system), but 1 at least is also shared with a cam bearing, so potentially there is just not enough going to it. I've found a bit of info since which says to drill out a few passages in the block, namely the one from the pump to the main gallery, and then also to enlarge the passages going to the mains that feed cams also, so this all makes sense, hopefully between that and bumping the pressure up will solve the issue.
the only other thing i did wonder about is the external oil pickup i have, i did wonder if maybe i had it too close to the sump floor, but i have confirmed since stripping the motor that i can actually just fit my finger under it, so that should be plenty enough of a gap allow sufficient oil into it - i did also wonder about oil slosh on launch, but i saw this issue on the dyno so that rules out g-forces.
@heff - yeah very lucky i didnt take out the cam or hurt the head thats for sure!