Mushroom lifters – Any advice

[scooder]

Re: Mushroom lifters – Any advice

If it's ground mushroom proper and you use a 1" lifter, the lifter foot would dig into the cam lobe at maybe 1/2 it's total lift. Remember the lifter starts to lift from the middle and as it lifts the lobe contact point travels out to the lifter outside edge.
Watch out for this when you test assemble. That is if it's ground for the mushroom lifter.
Martin.

 

[Lawrie]

Re: Mushroom lifters – Any advice

We use a crower roller cam and followers in our dragster,crower made it special for us,(thanks)
the fist thing I noticed when assembling the engine was how easy it was to turn over with the roller cam.
Also it went like a rocket, done four seasons and the cam and followers look just like new.
And yes ,it was a pain to assemble the springs and keepers, a two hour job and skinned fingers.
Lawrie

 

[Andrew_B]

Re: Mushroom lifters – Any advice

If this is a drag strip engine, are you aluminizing the block? ( filling it with aluminum)

Hey Ron, Yes the block is filled with aluminum. My father in law, Earl Floyd, had a few done about 25 years ago. If I were to do it today I'd use epoxy.

Andrew

 

[Andrew_B]

Re: Mushroom lifters – Any advice

Ron, here's a pic of the block with my intake.

 

[Ol' Ron]

Re: Mushroom lifters – Any advice

The reason why I ask this is when porting the block the top of the port can beake through on some castings. JWL has some info on ports and guides in his Book. I spent too much time looking for the Holy Grail of ports with a flow bench. But a blower and a little nitro can solve allot of breathing problems.
Good luck.

 

[scooder]

Re: Mushroom lifters – Any advice

With Earl Floyd on your team I expect some good times in the quarter. He had some fast flatmotors.
If my memory is working, he liked the Sharp style combustion chamber didn't he, the type that has a deeper cut into the head over the exhaust valve side. I seem to remember the Hanson solid head used this style and referenced Earl in the design idea. Something along the lines of "don't know why it worked as well as it did, but it did. Why mess with success"
Am I on the right track here, I don't have access to my notes to confirm, May even have the wrong bloke, but that's the bell that tingling in the back of my brain.
Martin

 

[Andrew_B]

Re: Mushroom lifters – Any advice

Hey Martin,

Earl ran some of his fastest times when he borrowed Hanson's heads. Luckily for me, I was able to get a hold of Virgil and purchase the same heads Earl ran 20 years ago. They have more volume over the exhaust valve and are designed for a pop-up piston.

Andrew

 

[Andrew_B]

Re: Mushroom lifters – Any advice

Hey Ron,

I'm using the twin to the block Earl ran with injected nitro that has set many records in it's day and is still a runner but not in a car at this time. One thing Earl had done was to machine out the intake runner and move it away from the exhaust valve and then inserts tubing. Also, he forms Belzona 1111 epoxy in both the intake and exhaust valve area to help "nudge" either the intake charge or exhaust flow.

Andrew

 

[Ol' Ron]

Re: Mushroom lifters – Any advice

Looking at the Sharp combustion chamber, it looks different than the early sharp heads. I also noticed the spark plug is in the transfer area, which would make this a grear combustion chamber for an economy engine, If the power tip plug would clear the exhaust valve. Someone could get some decent mileage out of a well tuned engine. I'll have to give that some thought. Good luck.

 

[scooder]

Re: Mushroom lifters – Any advice

Ron, Your spot on with your observation, it is different to the Sharp chamber, the Sharp has the plug in the more normal position, and the curved whopdedo twix the transfer area and piston crown area favoured the exhaust side and protruded further into the piston crown area.
I made the Sharp comparison based on the deeper chamber over the exhaust valve.
And of course this Hanson head is a Pop up.
on that note, Andrew, are these Hanson's going on the one with the mushroom cam system, centrifugal blower and stuff ? How much pop-up you got going on their? They cut for the traditional 7/16" Tattersfield-Baron pop-up?
Is your Father inlaw getting his hands dirty on your quest?
Thanks,
Martin.

 

[Ol' Ron]

Re: Mushroom lifters – Any advice

I'm not familar with the Hanson head, are these available now? With out the pop up??

 

[Andrew_B]

Re: Mushroom lifters – Any advice

Earl is pretty much sitting back and advising but I'm sure will be involved during the assembly. He's interested in how the mushroom lifters will work out. Something he's always wanted to try.

Yes, I'm going to run these heads on this build. I'm think it's less than 7/16 pop-up but not sure. For pistons, I'll be sending Ross a combustion chamber mold to at least get the piston crown to match the heads. They'll also be chamfered, similar to how the they did it for the FlatCad.

Andrew

 

[scooder]

Re: Mushroom lifters – Any advice

Ron, the Hanson head appeared early 90's as I recall. Machined out of a lump of billet. No water jackets, just solid. They were made for nitro burning drag motors. The fin design was inspired by a Navarro head, just cus it look pretty.
Don't know if there still available, of course, being solid any combustion chamber design is not a problem.
Martin.

 

[Andrew_B]

Re: Mushroom lifters – Any advice

Virgil only made 3 sets total.

Andrew

 

[Ol' Ron]

Re: Mushroom lifters – Any advice

Wouldn't work too well on the street. Be nice if Edelbrock would move the plug.

 

[Andrew_B]

Re: Mushroom lifters – Any advice

Hey Ron, where do you think the optimum plug placement (if there is one) should be? For performance of course. Do you think indexing plugs improves performance?

Andrew

 

[Ol' Ron]

Re: Mushroom lifters – Any advice

This is the modification I made to an Edelbrock head, moving the plug to the center of the transfer area. The reason is to reduce the flame front in conjunction with the .040" piston to head clearance. The power tip plug will help fire a leaner mixture.This chamber has been reduced in size (55cc) to raise the cr of a small (245ci) engine to over 8:1

 

[Andrew_B]

Re: Mushroom lifters – Any advice

This is off topic, which I think has pretty much run its course, but my 180 degree crankshaft showed up from Moldex last night. Here are a few pics, one is it next to an original Norden. The longer snout is to accommodate a 1" Supercharger pulley, a 1" oil/vacuum pump pulley, and a 1/2" fuel pump pulley, plus extra for crank support.

Andrew

 

[Ol' Ron]

Re: Mushroom lifters – Any advice

What is the stroke??

 

[Andrew_B]

Re: Mushroom lifters – Any advice

4.25" stroke. Also 2" chevy rod journals.

Andrew