Dumbo The Flying Elephant

Larry Hill · 07-26-2022, 08:43 PM

The worst thing about building you own race engine is I have no one to blame but myself. I wake up in the middle of the night and think of things I need to do or forgot to do the day before. It makes for a less than restful night.

Mike Gray · 07-27-2022, 12:57 AM

Quote:

Originally Posted by Larry Hill

The worst thing about building you own race engine is I have no one to blame but myself. I wake up in the middle of the night and think of things I need to do or forgot to do the day before. It makes for a less than restful night.

Ibuprofen-PM especially after crawling in and out or under the car.

Larry Hill · 07-28-2022, 06:38 PM

After redoing my coil bind set up three times I'm confident that my numbers are correct and repeatable. I have one head ready to bolt on for final check for clearance from coil bind. The other head is clean with seals, valves, and ready for spring assignment with assembly. It took two sets of springs to get eight springs on the intakes to all be at the same open and seat pressure. The exhaust side springs are 10 pounds lighter on open and seat.

Does anyone have the old style Larson Systems Solid Height Gage, if so I think I would be willing to purchase it.

More later

Larry Hill · 07-30-2022, 08:19 AM

Has anyone noticed how the tolerance of parts seems to be expanded. I bought some stuff that was advertised to be .060" thick out of 32 parts no more than four were .060" thick. Thickness range was .064" - .056". Many of them would vary .003" across a face of 1.311". All was not lost with the unintended variations in thickness it allowed a closer set up than + or - .015'' shim choice.

............and so it goes

Larry Hill · 07-30-2022, 08:11 PM

After cleanup, put up, straighten up it will be rod and bearings day. I’m happy with how close I was able get the heads to my target. I just hope I have the correct target.

Larry Hill · 07-31-2022, 02:43 PM

Checking for rod bolt stretch. .602 in the relaxed position. After .0055'' stretch to 6075''. After all the bolts I will check big end of rod. I think size is min. to max ID is only .0005.

Larry Hill · 08-01-2022, 07:33 PM

Rods all checked good. Installed bearings and checked crank pin size and I had the desired vertical clearance inside the bearings. I have new oil rings and second ring to check in the bores tomorrow. Tonight I’m doing a little paperwork so I don’t lose my way or remind me of what not to do next time.

07-26-2022, 08:43 PM	#1
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,648 Likes: 1,941 Liked 10,759 Times in 2,236 Posts	Re: Dumbo The Flying Elephant The worst thing about building you own race engine is I have no one to blame but myself. I wake up in the middle of the night and think of things I need to do or forgot to do the day before. It makes for a less than restful night. __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

07-28-2022, 06:38 PM	#3
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,648 Likes: 1,941 Liked 10,759 Times in 2,236 Posts	Re: Dumbo The Flying Elephant After redoing my coil bind set up three times I'm confident that my numbers are correct and repeatable. I have one head ready to bolt on for final check for clearance from coil bind. The other head is clean with seals, valves, and ready for spring assignment with assembly. It took two sets of springs to get eight springs on the intakes to all be at the same open and seat pressure. The exhaust side springs are 10 pounds lighter on open and seat. Does anyone have the old style Larson Systems Solid Height Gage, if so I think I would be willing to purchase it. More later __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817 Last edited by Larry Hill; 07-29-2022 at 08:48 AM.

07-30-2022, 08:19 AM	#4
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,648 Likes: 1,941 Liked 10,759 Times in 2,236 Posts	Re: Dumbo The Flying Elephant Has anyone noticed how the tolerance of parts seems to be expanded. I bought some stuff that was advertised to be .060" thick out of 32 parts no more than four were .060" thick. Thickness range was .064" - .056". Many of them would vary .003" across a face of 1.311". All was not lost with the unintended variations in thickness it allowed a closer set up than + or - .015'' shim choice. ............and so it goes __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817 Last edited by Larry Hill; 07-30-2022 at 12:27 PM.

07-30-2022, 08:11 PM	#5
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,648 Likes: 1,941 Liked 10,759 Times in 2,236 Posts	Re: Dumbo The Flying Elephant After cleanup, put up, straighten up it will be rod and bearings day. I’m happy with how close I was able get the heads to my target. I just hope I have the correct target. __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

07-31-2022, 02:43 PM	#6
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,648 Likes: 1,941 Liked 10,759 Times in 2,236 Posts	Re: Dumbo The Flying Elephant Checking for rod bolt stretch. .602 in the relaxed position. After .0055'' stretch to 6075''. After all the bolts I will check big end of rod. I think size is min. to max ID is only .0005. Attached Thumbnails __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817 Last edited by Larry Hill; 07-31-2022 at 04:59 PM.

08-01-2022, 07:33 PM	#7
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,648 Likes: 1,941 Liked 10,759 Times in 2,236 Posts	Re: Dumbo The Flying Elephant Rods all checked good. Installed bearings and checked crank pin size and I had the desired vertical clearance inside the bearings. I have new oil rings and second ring to check in the bores tomorrow. Tonight I’m doing a little paperwork so I don’t lose my way or remind me of what not to do next time. __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

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