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pushrods
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squeeezer
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PostPosted: Thu Apr 01, 2010 2:09 am    Post subject: pushrods Reply with quote

at what point do you guys upgrade from 5/16 to 3/8 pushrods in a sbc????

im gonna measure for pushrods soon just wondering before i order

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10sec.et
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PostPosted: Thu Apr 01, 2010 2:33 am    Post subject: Reply with quote

seems the general consensus is "the biggest you can fit". there has to be some sort of scientific means of figuring it out. a formula perhaps ? hell, i would like to use 5/16 to give me more room to port my heads.
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William Jones
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PostPosted: Thu Apr 01, 2010 10:42 am    Post subject: Reply with quote

I would say when you step up to a mechanical roller or turn more than 6000 rpm would be good starting points. For the bigger pushrod.

Bam

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squeeezer
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PostPosted: Thu Apr 01, 2010 11:54 am    Post subject: Reply with quote

[quote="William Jones"]I would say when you step up to a mechanical roller

yes


or turn more than 6000 rpm would be good starting points. For the bigger pushrod.


and yes

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jeep_406
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PostPosted: Thu Apr 01, 2010 11:27 pm    Post subject: Reply with quote

6000 rpm is a good number no matter what type of cam you're using. I like overkill whenever possible Driving
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Big Dave
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PostPosted: Fri Apr 02, 2010 2:02 pm    Post subject: Reply with quote

I always go for a bigger push rod as it is only $20 bucks for the push rod guide plates and I generally order custom length push rods any way which all cost the same despite the size difference.

I have bent far to many stock 3/8 inch diameter push rods in a BBC to ever consider running anything smaller than a 7/16" push rod and up to a 1/2" push rod for a race motor (requires titanium valves and keepers, accuated by a solid roller cam, to be considered a race motor in my opinion). My 406 SBC uses 3/8th inch chromemoly CompCams push rods with raised CompCams guide plates in my Lunati sold roller cammed daily driver.

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squeeezer
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PostPosted: Fri Apr 02, 2010 4:52 pm    Post subject: Reply with quote

why a raised guideplate??
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af2
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PostPosted: Fri Apr 02, 2010 8:48 pm    Post subject: Reply with quote

What spring pressure you gona run with Paul's Lunati??
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lun40119
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PostPosted: Fri Apr 02, 2010 10:05 pm    Post subject: Reply with quote

Here is a couple of screen shops from the Spin Tron stuff I had done on my cam from last year. It is old news though, I will be running a different cam. For reference, this is a 3.8 .080 wall Trend pushrod, 240ish at the seat.

Take what you can from these couple graphs, if you want more, I would be willing to share all that I have.......Blue line is the valve base, and red is the actual valve trace with the laser. Quick side note, I'll be running 7/16 pushrods this year with a .450 offset rocker. Wink




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af2
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PostPosted: Fri Apr 02, 2010 10:24 pm    Post subject: Reply with quote

Jake,
For what it's worth.
Argggggggg
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squeeezer
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PostPosted: Fri Apr 02, 2010 11:08 pm    Post subject: Reply with quote

af2 wrote:
What spring pressure you gona run with Paul's Lunati??






it should be a tad over 180# seat
i will need to measure for exact #'s

and its a crower btw

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Last edited by squeeezer on Fri Apr 02, 2010 11:17 pm; edited 1 time in total
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lun40119
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PostPosted: Fri Apr 02, 2010 11:08 pm    Post subject: Reply with quote

Not too sure what your getting at.....the fact that you saw this stuff on st, or the fact that no matter how my times the 5/16---3/8 debate has been going on, people still ask the question.

Which is it gramps???

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squeeezer
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1991 Chevrolet Camaro

PostPosted: Fri Apr 02, 2010 11:13 pm    Post subject: Reply with quote

base v.s. trace????

i dont know

is it showing deflection @ the pushrod????

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af2
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PostPosted: Fri Apr 02, 2010 11:27 pm    Post subject: Reply with quote

squeeezer wrote:
af2 wrote:
What spring pressure you gona run with Paul's Lunati??






it should be a tad over 180# seat
i will need to measure for exact #'s

and its a crower btw


This is exactly where I am coming from!!

I still am not convinced my 800 over needs more pushrod.
I will say at 180 you could run 5/16" but that is me!


Jon, do not spin the thing above 7500 or you will be sorry.

Jake, Spintron and all I still wonder how all the old guys spun the things 10,000 with 5/16 pushers and they lived. That is all I am saying.
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Big Dave
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PostPosted: Fri Apr 02, 2010 11:38 pm    Post subject: Reply with quote

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
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