Is this the problem with flat tappet stuff?

turbodave · December 17, 2022, 10:31:31 PM

Thought this video would interest some of you.

These were my (new) lifters that I sent to Powell as I just was not massively impressed with them and wanted a second opinion.
Sadly he didn't show the finished result in the video, but I'll post here when I get them back.

https://youtu.be/MbRjAMhCEJk

Airwreckc · December 18, 2022, 09:46:17 AM

Dave, where is he located? Looks like a good machine shop.

MGBV8 · December 18, 2022, 12:46:28 PM

Friends don't let friends buy cheap lifters.

mgb260 · December 18, 2022, 01:09:03 PM

Old Delphi lifters and Johnson lifters are the best in my opinion. Comp cams and Morel are a little noisier. Looks like those lifters missed final polishing and definitely quality control.

mgb260 · December 18, 2022, 02:42:28 PM

On Chris's car, now Ian's. 300 stroked to 350. Crower cam saver lifters for over 8 years with no issues. There is a slot ground full length of the lifter body allowing a little extra oil to lube the contact point between the cam and lifter. Comp cams has a tool to groove the lifter bores to do the same thing. Newer solid lifters have a small hole in the face too.

turbodave · December 18, 2022, 03:29:43 PM

Just to clarify for everyone's benefit.

These were crower lifters that I sent to Powell Machine. These were the expensive 'camsaver' ones. They were definitely not cheap lifters.
I knew as soon as I opened the boxes that something was not right with these.

If you watch the video, you will see that I was justified in my concerns.
I might of got lucky with them, but equally I would not of been surprised knowing what I do know now, if I would have wiped out a lobe or two.

mgb260 · December 18, 2022, 03:47:52 PM

Dave, Did you contact Crower? They probably contract the lifters out and didn't even open the boxes.

turbodave · December 18, 2022, 07:15:21 PM

Nope, what are they going to do; argue the point, or sit on the.m while they 'inspect' them before eventually sending another set that'll probably look the same?
Sod that, I've got a pair of race engines to build! :-)

mgb260 · March 20, 2023, 04:30:49 PM

Dave, Did you get your lifters back yet?

minorv8 · March 21, 2023, 03:49:53 AM

Quality control ?

Comp Cams lifter straight from the box.

turbodave · March 23, 2023, 10:34:20 AM

Hi Jim,
Yes, Powell turned them around in 2 weeks.
They look fantastic.

ag1234 · March 30, 2023, 01:41:39 PM

Just curious here, has anyone built a roller cam motor ? I still have12 blanks. IFI don`t run out of time ? Art.

Roverbeam · March 30, 2023, 05:34:32 PM

I'm told the hydraulic roller spring loads are all the 300 head's aluminum can handle, even with thread inserts.

But if, say, I went to the TA head at some future point, it'd be nice not to be limited by part scarcity in deciding what kind of cam to use. Feel free to post or pm a price, if you're looking to unload one?

BlownMGB-V8 · March 30, 2023, 07:33:59 PM

I have a fresh 300 stroker with a roller cam and TA heads on the stand. Also a 300 short block with a roller, and am awaiting machine work and parts on my 340 with a roller cam and late Rover heads. I think it makes sense. Costs a bit more of course but I think that's a fair trade for what you get.

Jim

Roverbeam · March 31, 2023, 09:12:20 AM

Yeah, as I was sharing my parts spreadsheet with someone, it was apparent the cost to get the flow I want might have been less with TA than 300 heads. I started off following some of the classic recipes, perhaps resistant to the TA head since it had a big initial cost and a lot of unknown additional changes needed.

From the other thread, I thought your engines were also hydraulic rollers, with 300-350# open pressure valve springs? -vs solid rollers, needing 600# springs?

I'd be curious what cam spec -LSA/overlap, durations, lift- would be possible with a solid roller that fits within our small-diameter cam journals? I wanted something like 108 LSA, 300 seat-seat duration, but got something milder.

BlownMGB-V8 · March 31, 2023, 09:42:19 AM

The complete 300 stroker has a solid roller cam. The 300 short block has a hydraulic roller. The 340 will have the same cam as in the first engine, which has the TA heads and Ti valves. Spring pressures are in the 350 range with both those and the Rover heads. Those heads are interchangeable as they use the same chamber size. 300 heads are not.

Spring pressure and rpm potential go hand in hand. Obviously more lift requires more spring and rollers require more spring than flat tappet due to the steeper ramps that are possible.

Jim