Dumbo The Flying Elephant

Larry Hill · 07-20-2022, 02:07 PM

Setting up to make custom shims for Dumbo, sometimes times I feel like the Dumbo.

Larry Hill · 07-22-2022, 06:58 AM

Today I should be able to assign springs to valves get them assembled and verify coil bind. It should be a busy day.

The reason for all the lathe work is the valve guide bosses have a healthy radius at the bottom where the spring cup or shim seat. Some of the shims I had to turn the OD down to fit the pockets or bore the ID to go over the guide boss.

Greg West · 07-24-2022, 02:30 PM

Amazing all the work involved to build a fast race engine. Every detail needs to be checked and double checked. Awesome work Larry.

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

07-20-2022, 02:07 PM	#1
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,648 Likes: 1,941 Liked 10,756 Times in 2,236 Posts	Re: Dumbo The Flying Elephant Setting up to make custom shims for Dumbo, sometimes times I feel like the Dumbo. __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

07-22-2022, 06:58 AM	#2
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,648 Likes: 1,941 Liked 10,756 Times in 2,236 Posts	Re: Dumbo The Flying Elephant Today I should be able to assign springs to valves get them assembled and verify coil bind. It should be a busy day. The reason for all the lathe work is the valve guide bosses have a healthy radius at the bottom where the spring cup or shim seat. Some of the shims I had to turn the OD down to fit the pockets or bore the ID to go over the guide boss. Attached Thumbnails __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

07-24-2022, 02:30 PM	#3
Greg West Junior Member Join Date: Jul 2016 Posts: 63 Likes: 26 Liked 52 Times in 22 Posts	Re: Dumbo The Flying Elephant Amazing all the work involved to build a fast race engine. Every detail needs to be checked and double checked. Awesome work Larry.

07-26-2022, 08:43 PM	#4
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,648 Likes: 1,941 Liked 10,756 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	#6
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,648 Likes: 1,941 Liked 10,756 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	#7
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,648 Likes: 1,941 Liked 10,756 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.

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