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pushrods
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lun40119
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Joined: 22 Oct 2008
Posts: 624
Location: Wisconsin
4740.92 points


1967 Chevrolet Chevelle

PostPosted: Fri Apr 02, 2010 11:53 pm    Post subject: Reply with quote

In the olden days grampa, Smile the had a butt load of seat timing with lazy old people lobes. Todays aggressive loads excelerate the valves ALOT quicker.

That lobe in the graph is a 20 year old legacy lobe from Lunati. I am not trying to be a smarta$$ Adam, I am just having some fun with you. Wink


Base is the actual valve motion, based on what the cam says. Trace is what the laser sees at rpm.

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af2
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Joined: 01 Sep 2003
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Fri Apr 02, 2010 11:54 pm    Post subject: Reply with quote

Big Dave wrote:
Well from one old guy; I can say that not not all of them lived. And of those that held together the technology was changing fast enough that they were often pulled out of service before they were spread across the strip and replaced by another more promising combination as parts were relatively cheap when all you had was mass produced factory parts.

Big Dave


Dave, you have a point.lol
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af2
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Fri Apr 02, 2010 11:59 pm    Post subject: Reply with quote

lun40119 wrote:
In the olden days grampa, Smile the had a butt load of seat timing with lazy old people lobes. Todays aggressive loads excelerate the valves ALOT quicker.

That lobe in the graph is a 20 year old legacy lobe from Lunati. I am not trying to be a smarta$$ Adam, I am just having some fun with you. Wink


Base is the actual valve motion, based on what the cam says. Trace is what the laser sees at rpm.


Jake,
It's all good.
Before spintrons we used asstrons. If it blew you could bet you're ass it will cost you.
Now you can bet you're ass before it blew it will cost you!lol
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lun40119
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Joined: 22 Oct 2008
Posts: 624
Location: Wisconsin
4740.92 points


1967 Chevrolet Chevelle

PostPosted: Sat Apr 03, 2010 12:00 am    Post subject: Reply with quote

squeeezer wrote:
base v.s. trace????

i dont know

is it showing deflection @ the pushrod????


Yes there is deflection at the opening which stores energy in turn releasing that energy causing the valve to loft up over the nose and land harshly causing it to deflect again............store energy and bounce. There are two ways to approach this........a crap load of spring pressure forcing the valvetrain to follow the cam, stealing HP, and being hard on parts, or design the valvetrain to loft up over the nose, and land softly on the backside. This is common in come roundy round stuff. That is what we will be doing with this years setup. Trick is to control the loft with spring, but not overpower the loft causing the lifter to slam back into the lobe.

For you guys that are running solids with your typical spring combo. This is likely what is happening and you don't even know it. My stuff was just your typical bracket setup. Nothing trick with the cam or springs. If you'd like I can post up a graph, of what a really nasty lobe looks like when you don't control it. There is deflection at the nose of the cam because the lifter comes out of loft at the nose so sharply it lands and the weight of the valve/spring combo causes deflection. Let me know I will post it........




Squisher.............I would put a 3/8pushrod in it.

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lun40119
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Joined: 22 Oct 2008
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Location: Wisconsin
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1967 Chevrolet Chevelle

PostPosted: Sat Apr 03, 2010 12:01 am    Post subject: Reply with quote

af2 wrote:
lun40119 wrote:
In the olden days grampa, Smile the had a butt load of seat timing with lazy old people lobes. Todays aggressive loads excelerate the valves ALOT quicker.

That lobe in the graph is a 20 year old legacy lobe from Lunati. I am not trying to be a smarta$$ Adam, I am just having some fun with you. Wink


Base is the actual valve motion, based on what the cam says. Trace is what the laser sees at rpm.


Jake,
It's all good.
Before spintrons we used asstrons. If it blew you could bet you're ass it will cost you.
Now you can bet you're ass before it blew it will cost you!lol



LOL, even if it doesn't blow this stuff costs money. I am getting fired up man. This thing is going to rip.......Very Happy

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af2
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1933 Willys Coupe

PostPosted: Sat Apr 03, 2010 12:15 am    Post subject: Reply with quote

[quote="lun40119"]
squeeezer wrote:
There are two ways to approach this........a crap load of spring pressure forcing the valvetrain to follow the cam, stealing HP, and being hard on parts, or design the valvetrain to loft up over the nose, and land softly on the backside. This is common in come roundy round stuff.




Squisher.............I would put a 3/8pushrod in it.


Jake,This lofting crap is all it is CRAP. Put a FN spring in there that will control it and be done! Tom is going to prove to you what a blow hard he is when you are done. I hate to say it but you will find out!

Look up the Blown Alky post? If he had a clue he should not have posted. Instead he talks like the guru that knows it all running .003 on the rods where we have already blown up to many engines using that mentality. Tell MR. Tom we run .009 rods to make it live!!!lol
I'll bet he craps on that one!

Any way I wish you the best!
Adam
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squeeezer
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1991 Chevrolet Camaro

PostPosted: Sat Apr 03, 2010 12:18 am    Post subject: Reply with quote

i will do the 3/8

and i do not expect to see anything north of 7000 rpm to be honest

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lun40119
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Joined: 22 Oct 2008
Posts: 624
Location: Wisconsin
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1967 Chevrolet Chevelle

PostPosted: Sat Apr 03, 2010 12:26 am    Post subject: Reply with quote

[quote="af2"]
lun40119 wrote:
squeeezer wrote:
There are two ways to approach this........a crap load of spring pressure forcing the valvetrain to follow the cam, stealing HP, and being hard on parts, or design the valvetrain to loft up over the nose, and land softly on the backside. This is common in come roundy round stuff.




Squisher.............I would put a 3/8pushrod in it.


Jake,This lofting crap is all it is CRAP. Put a FN spring in there that will control it and be done! Tom is going to prove to you what a blow hard he is when you are done. I hate to say it but you will find out!

Look up the Blown Alky post? If he had a clue he should not have posted. Instead he talks like the guru that knows it all running .003 on the rods where we have already blown up to many engines using that mentality. Tell MR. Tom we run .009 rods to make it live!!!lol
I'll bet he craps on that one!

Any way I wish you the best!
Adam


Guy does come from TRD, and before that he was with DEI. Can't be too dumb if you working with those kind of teams.......

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lun40119
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1967 Chevrolet Chevelle

PostPosted: Sat Apr 03, 2010 12:27 am    Post subject: Reply with quote

I would also be willing to bet that if you spun your stuff, it is lofting...........
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af2
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1933 Willys Coupe

PostPosted: Sat Apr 03, 2010 12:32 am    Post subject: Reply with quote

lun40119 wrote:
I would also be willing to bet that if you spun your stuff, it is lofting...........


Jake,
don't drink the koolaid. Thats all I say.
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af2
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1933 Willys Coupe

PostPosted: Sat Apr 03, 2010 12:38 am    Post subject: Reply with quote

squeeezer wrote:
i will do the 3/8

and i do not expect to see anything north of 7000 rpm to be honest


OH yea back to the original post! Laughing

If you need stock length 3/8" I have a set of .080 Erson's with very little time. I might even have a set of raised guide plates.
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lun40119
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1967 Chevrolet Chevelle

PostPosted: Sat Apr 03, 2010 12:56 am    Post subject: Reply with quote

And in the interest of helping out.........if you need a 8.100 3/8, I have a set. Good luck dude.
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af2
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1933 Willys Coupe

PostPosted: Sat Apr 03, 2010 2:40 am    Post subject: Reply with quote

Jake!!!!! 8.100???? lol

You know I messin with you. I hope Embarassed
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lun40119
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Joined: 22 Oct 2008
Posts: 624
Location: Wisconsin
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1967 Chevrolet Chevelle

PostPosted: Sat Apr 03, 2010 8:29 am    Post subject: Reply with quote

Not all of us are running lil shorty valves like you are Adam. 1.950 installed, +.200 valves with the T&D rockers that called for a +250 stand, and a +.300 pushrod. Very Happy This stuff is magic and voodoo Adam. Maybe when I am done with this bullet, Ill ship it out there and give you a taste of bottom 8's. Smile On pump gas of course. Thats if that cart is still around 2000lbs. If you can hook it.....LOL
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squeeezer
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1991 Chevrolet Camaro

PostPosted: Sat Apr 03, 2010 1:21 pm    Post subject: Reply with quote

af2 wrote:
squeeezer wrote:
i will do the 3/8

and i do not expect to see anything north of 7000 rpm to be honest


OH yea back to the original post! Laughing

If you need stock length 3/8" I have a set of .080 Erson's with very little time. I might even have a set of raised guide plates.






i may.......
i measure today
i tried the other day and all iknow so far is 7.850 is a little too long
then my wife needed me in the house Wink

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