Solid Roller of Flat Tappet?

General engine tech -- Drag Racing to Circle Track

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Rick Finsta
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Re: Solid Roller of Flat Tappet?

Post by Rick Finsta » Fri Oct 13, 2017 7:35 am

Mike, what is idle RPM for one of those offshore boats?

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Re: Solid Roller of Flat Tappet?

Post by CamKing » Fri Oct 13, 2017 10:49 am

Rick Finsta wrote:
Fri Oct 13, 2017 7:35 am
Mike, what is idle RPM for one of those offshore boats?
800rpm
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Re: Solid Roller of Flat Tappet?

Post by pdq67 » Sun Oct 15, 2017 11:56 pm

Fwiw, before he passed, UDHarold made me a solid flat tappet lifter copy of CC's great old 288AR solid street roller and gave it to me.

He said that it should hang right with the 288AR and possibly do a bit better.

Spec's are:

278/249/161, 110/106, .618" gross lift and it need's .018" hot lash on both sides.

I bugged Harold for quite a while to make it because I am scared of needle-bearing lifters!

pdq67

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Re: Solid Roller of Flat Tappet?

Post by KnightEngines » Mon Oct 16, 2017 12:44 am

I'm going through this lately with street/strip customer engines that will be driven a lot, I have been defaulting to solid flat tappet cams & going up on the rocker ratio.
But the spring pressures we're needing to keep the valve train under control at 7500+rpm are getting scary on an iron flat tappet - 160lb on the seat, 440lb over the nose, .630" lift with 1.72 rocker ratio. So far so good, but I know we're pushing the limit.

Next one I'm going to a solid roller with Cranes street roller .400" lobes, *should* last as long & gain a little right through the rpm range, springs required are gonna be similar (a tad heavier), peak lift will be much the same & will have a little more area under the curve & a little shorter on advertised duration etc, so will idle a bit cleaner.

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Re: Solid Roller of Flat Tappet?

Post by nickpohlaandp » Mon Oct 16, 2017 9:11 am

pdq67 wrote:
Sun Oct 15, 2017 11:56 pm
Fwiw, before he passed, UDHarold made me a solid flat tappet lifter copy of CC's great old 288AR solid street roller and gave it to me.

He said that it should hang right with the 288AR and possibly do a bit better.

Spec's are:

278/249/161, 110/106, .618" gross lift and it need's .018" hot lash on both sides.

I bugged Harold for quite a while to make it because I am scared of needle-bearing lifters!

pdq67
Have you run it? If you have, or if you haven't and are planning to, what is the displacement of the engine you're using it for? I'm just thinking 0.618" won't be enough.
Never half ass two things... Whole ass one thing!

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Re: Solid Roller of Flat Tappet?

Post by mark_follweiler » Mon Oct 16, 2017 1:51 pm

the first solid roller I did for the street is still doing great! built in 2006, freshened in 2012. just guessing maybe 20,000 miles. LOTS of passes.... :D

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Re: Solid Roller of Flat Tappet?

Post by GARY C » Mon Oct 16, 2017 2:06 pm

Yes a "properly" done valve train will be more reliable!
More area and lift will make more power, so that leaves you with a properly designed roller (hyd or solid) if the goal is max power.

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Re: Solid Roller of Flat Tappet?

Post by BOSS 429 » Tue Oct 17, 2017 10:45 pm

solid roller get my vote,will make more power

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