scsmith
Well Known Member
I have an angle-valve IO-360-A1A, horizontal induction on an RV-8
I fit the spinner bulkhead to the flywheel/crankshaft with 2-1/4 inch spacer tubes.
I just finished fitting/trimming the cowl. The top-front of the cowl sits about a 1/16 inch to 1/8 inch low with respect to the spinner bulkhead to account for motor-mount sag, and the cowl is centered left-right on the spinner bulkhead. I have just exactly a 1/4 inch gap between the cowl and the spinner bulkhead.
So, it seems like the cowl is in the perfect spot.
Then, I looked inside. The cowl is within less than a 1/2 inch vertical distance, and about 1/4 inch min-distance of the left front (#2) cylinder. The point on the cylinder that is very close is the threaded lug on the cylinder where the baffle mounts.
On the right side, the clearance is slightly more, but nothing to be confident about, probably 7/8" vertical and just over a 1/2" min-distance.
It looks to me like the lugs are going to hit the cowl when it wet-dog shakes, let alone with a baffle and rubber baffle seal.
And, its a bit odd to me that the right cylinder would have more clearance, since that cylinder is farther forward, you would think the cowl would come closer to it.
What did I do wrong?
I'm wondering if they sent me the wrong upper cowl? The lower cowl is labeled IO-360, but the upper just says RV-8. If there is only one, it seems too close a fit to the bigger engine.
At first I thought maybe I mounted the cowl slightly rotated, but the lower cowl dictates the rotational position as the lower corners engage on the lower corners at the firewall. Then, the cooling openings must fit bottom to top . So I couldn't have done that wrong. I measured, and if anything, the left side is slightly higher - would have given slightly more, not less, clearance to the left cylinder. So, I'm puzzled.
I fit the spinner bulkhead to the flywheel/crankshaft with 2-1/4 inch spacer tubes.
I just finished fitting/trimming the cowl. The top-front of the cowl sits about a 1/16 inch to 1/8 inch low with respect to the spinner bulkhead to account for motor-mount sag, and the cowl is centered left-right on the spinner bulkhead. I have just exactly a 1/4 inch gap between the cowl and the spinner bulkhead.
So, it seems like the cowl is in the perfect spot.
Then, I looked inside. The cowl is within less than a 1/2 inch vertical distance, and about 1/4 inch min-distance of the left front (#2) cylinder. The point on the cylinder that is very close is the threaded lug on the cylinder where the baffle mounts.
On the right side, the clearance is slightly more, but nothing to be confident about, probably 7/8" vertical and just over a 1/2" min-distance.
It looks to me like the lugs are going to hit the cowl when it wet-dog shakes, let alone with a baffle and rubber baffle seal.
And, its a bit odd to me that the right cylinder would have more clearance, since that cylinder is farther forward, you would think the cowl would come closer to it.
What did I do wrong?
I'm wondering if they sent me the wrong upper cowl? The lower cowl is labeled IO-360, but the upper just says RV-8. If there is only one, it seems too close a fit to the bigger engine.
At first I thought maybe I mounted the cowl slightly rotated, but the lower cowl dictates the rotational position as the lower corners engage on the lower corners at the firewall. Then, the cooling openings must fit bottom to top . So I couldn't have done that wrong. I measured, and if anything, the left side is slightly higher - would have given slightly more, not less, clearance to the left cylinder. So, I'm puzzled.