Herb Becker's new Land Speed motor pics... 3rd time's a charm??

Eldo · Apr 20, 2019

Cylinders, Sleeved with LA Sleeve FL80 sleeves, then bored to 81mm.

Herb Becker's new Land Speed motor pics... 3rd time's a charm??

"BSA style" lifters.

Lifters extended to maintain stability in lifter block with high lift cam (.480" lift)

Eldo · Apr 20, 2019

Herb Becker 1 pc pre-hardened 4340 steel crank. 73mm stroke, and custom pistons from JS Motorsports. Carrillo rods. Notice the ring lands moved down to accomodate deeper valve pockets.

Material removed from under piston to lighten up.

Eldo · Apr 20, 2019

44mm intake, 38mm exhaust valves, 7mm stems, JS Motorsport BeeHive springs.

Modified "Big Block" Chevy pushrods.

Eldo · Apr 20, 2019

JS Motorsport "Stage 4" cam, .480" lift.

Eldo · Apr 20, 2019

Steel "girdle" bolted to drive-side crank case.

lcrken · Apr 20, 2019

Great pictures. Are those carbon fiber push rods? The only Commando engine (872 cc road racer) I've seen use them didn't end too well. One of the push rods disintegrated.

These are the remaining three. I notice that yours are larger diameter, so should be stiffer.

Ken

Eldo · Apr 20, 2019

Ported and flowed head; 38mm intake, modified intake face plate

re-angled valve guides (+2º)

Shortened valve guides

Herb Becker intake runner.

Eldo · Apr 20, 2019

lcrken said:
Great pictures. Are those carbon fiber push rods? The only Commando engine (872 cc road racer) I've seen use them didn't end too well. One of the push rods disintegrated.

These are the remaining three. I notice that yours are larger diameter, so should be stiffer.

View attachment 9838

Ken

Big Block Chevy pushrods.

lcrken · Apr 20, 2019

Which carbs do you plan to run on it this year? I think you mentioned previously that you had 38, 40, and 44 mm Mikunis to choose from. The size of those manifolds look like you might be running the big guns.

Ken

snail · Apr 21, 2019

Are the lifter extensions bronze welded or silver soldered? Want to do this myself but don't want to upset the stellite bond.

Eldo · Apr 21, 2019

lcrken said:
Which carbs do you plan to run on it this year? I think you mentioned previously that you had 38, 40, and 44 mm Mikunis to choose from. The size of those manifolds look like you might be running the big guns.

Ken

We ran the 44m Mikunis on the 920cc motor last year; we found they worked great in the 1/4 mile at the drag strip, but we feel they were a bit big for a 3 mile run on the salt (not enough velocity for sustained 7500rpm), so we will be trying the 40mm carbs on both the 920 and the 750, with 38mm carbs in reserve to try as well, in hopes of increasing the velocity (and rpm.)

Eldo · Apr 21, 2019

snail said:
Are the lifter extensions bronze welded or silver soldered? Want to do this myself but don't want to upset the stellite bond.

Silver soldered.

Atlas Commando · Apr 21, 2019

I hope you have a fun and fruitful trip this year!

MichaelB · Apr 26, 2019

Eldo said:
Herb Becker 1 pc pre-hardened 4340 steel crank. 73mm stroke, and custom pistons from JS Motorsports. Carrillo rods. Notice the ring lands moved down to accomodate deeper valve pockets.

Excuse the novice question here, how is that flywheel secured?

Bernhard · Apr 27, 2019

Re; "Excuse the novice question here, how is that flywheel secured?"
T slot- you can see it if you magnify the pic.

MichaelB · Apr 27, 2019

How is it secured to the T -slot?

Bernhard · Apr 29, 2019

Is there not a hole on the bottom of one flywheel weight that appears to have some sort of Allen screw bold going through it?

Herb Becker's new Land Speed motor pics... 3rd time's a charm??

Eldo

Eldo

Eldo

Eldo

Eldo

lcrken

Eldo

Eldo

lcrken

snail

Eldo

Eldo

Atlas Commando

MichaelB

"Sons of Arthritus"

Bernhard

MichaelB

"Sons of Arthritus"

Bernhard

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