AC.net/aircooled.net HD alu pushrods

[1961bluebug]

Hi guys,

I´m curious who is runing these pushrods in their hi-po engine? Please share your valvetrain combo and experience and if you are using straight and tapered version.

I´m deciding on what to use in my engine, I don´t like the extra added weight of Cr-Mo pushrods.

my valvetrain combo is:

2276ccm
FK8 cam
CB lightweight ligters
CB 1.4 rockers
42x37 valves
dual valve springs (Steve Tims Stage 2s)

Thank you.

Jan

[1961bluebug]

anybody?
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[Stripped66]

With your combo, I'd run them.

I used the straight alu pushrods with my roller-cammed daily driver. I was running more spring pressure than the limits John advertises, and the cam had steeper ramps than any cam anybody previously used with those pushrods. Eventually one of them broke (duh! I used them well beyond their advertised limits...I shouldn't have expected anything less).

That said, if I were in your position, with valve springs pushing 320-350 lbs over the nose, I'd run the straight alu pushrods again.
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[Joel Mohr]

I believe those are the Smith Bros. pushrods, and I use them with LS1 beehives to 7200 on an 86c with Pauter 1.5s, no problems....
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SEE YOU AT THE RACES!!!!

[1961bluebug]

thank you Stripped66 and Joel
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[dan97019]

Im using them in my 1835 w/engle 120 1.1 solid rockers with elephant feet adjusters and single heavy duty springs they are a little pricey but well worth it as far as im concerned to get rid of the rattle that goes along with the steel or chro mo pushrods.

[AdrianH]

I used them in a 2276 FK8 bugpack 4047 springs 44 x 37 valves, the occasional blast to 8000, no worries.

[webebuggin]

I'm using them in my 2110 with Steve Tims dual springed heads, FK-7 w/ 1.4's.. WAY better, and quieter than the cro-mo/loose zero set up i was using.....

[1961bluebug]

OK then it seems that I´m decided to give them a try.
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[tattooed_pariah]

[1961bluebug]

some pics of my freshly delivered AC.NET pushrods

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[vgajames]

[Alan_U]

I'd go tapered version for stiff valve springs. Also watch for the ends pounding out.

Even with the stronger tapered version I know someone bending them with stiff new duals with 86C. Valves were 7mm too!!

For a street car I think they'd be great. Under brutal high rpm abuse I'd go the oldschool chromoly with stiff valve springs for valve bounce/float control.
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11.92sec pump gas true daily driver. Who says it cant be done.

No more time for VW's.......

[stealth67vw]

[Alan_U]

Hey Stealth,

Just by looking at the "machinist's bible" my machinist friend said its amazing people are making such a thing. Especially for one of the longest pushrod engines made aka our beloved flat4.

If you know enough people the aluminum pushrods in some applications BEND ripping off the pushrod tubes.

A set of berg 160,000psi pushrods (slightly lighter) than tapered Mantons with the typical valvetrain should be fine with fresh VW duals. Many hotstreets really have no need to go beyond 7500 rpms if you look at the cams they are using. Many streeet ports (heads) with a "streetable" cam profile probably cannot sustain efficient flow beyond 7500rpms anyways.

I granny shift at 7200 rpms and pull my 11.90's and 12.00's. Why abuse your engine if it falls on its face?

I'm not an aluminum hater but I will use chromoly pushrods due to less flex.

Just remember valve size also contributes to weight of the valvetrain.

PEOPLE must also realize that you CANNOT take JOEL MOHR's (NO disrespect JOEL) testamonial because he is using beehives. Beehives reduce the harmonic confusion so there is less chance of valve bounce and float. Using straight traditional springs will have a point where harmonics will NOT provide appropriate pressure.

Chromoly thankyou.
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11.92sec pump gas true daily driver. Who says it cant be done.

No more time for VW's.......

[lostinbaja]

I have been running AC.net straight aluminum PR's with a Web 86B @350lb. over the nose with no issues. The engine sees 7000 to 7500 rpm on occasion.
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Jerry...
If it's being towed, it must be a trailer!
"Vee Grow Too Soon Oldt Und Too Late Schmardt"
RIP Morgan

My photos
http://www.manxgallery.org/gallery/album92

[Joel Mohr]

None taken....Valve train components MUST be considered as a package. Jerk in a cam that is very severe will even bend that best chromos...
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SEE YOU AT THE RACES!!!!

[1961bluebug]

Well keep in mind that my engine will see no track use and I think that it will hardly see 7000R rpms. Because it´s all I have I´ll give them a try.
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[J DUB]

I rev this combo up to 7000 rpm. So far so good.

Specs: 76x94 (2109)

Alum. high roof case, full flowed, shuffle pinned
CB 76mm forged, cw crank
Mahle 94A pistons
CB 5.4 Unitec rods
Web 86b cam with Magnum straight cuts
DRD 043 level 5 ported heads 40x35, manley ss valves, dual springs
CB 1.4:1 rockers, solid shafts
Aircooled.net 3/8 inch super-hd alum. push rods
CB light wt. lifters
Mallory Uni-Lite grey/grey springs, Bosch blue coil, Taylor Spiro Pro wire
dual 45 Dellortos, match ported intakes:
36 vents, 155 main jets, 70 idle jets, 180 air correction jets, 55 pump jets
1 5/8 ceramic coated merged header, single hide away muffler
BMD serpentine belt kit
Berg welded and balanced fan
CB 12.5 lb. forged flywheel
Kennedy stage 1 pressure plate
Daiken disc
3.5 qt. sump
9.3:1 comp. ratio

[Eaallred]

I've been toying around with the idea of the dual tapered aluminum in my race car. It see's 9000rpm with K-800's and heavy 48mm intake valves. It's tempting to try, but i'll probably wait until I go Ti valves at least.
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Eric Allred

You have to remember something: Everybody pities the weak; Jealousy you have to earn.