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turbodave
dave cox

(194 posts)

Registered:
04/30/2018 03:00PM

Main British Car:
SD1

Is this the problem with flat tappet stuff?
Posted by: turbodave
Date: December 17, 2022 10:31PM

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.

[youtu.be]
EE606000-3FED-4AEB-A4CB-A81F54F2D4CA.jpeg


Airwreckc
Eric Cumming
RTP, North Carolina
(253 posts)

Registered:
05/28/2020 10:10AM

Main British Car:
1972 MGB-GT (working on a Sebring project) Buick 300-4 V8

Re: Is this the problem with flat tappet stuff?
Posted by: Airwreckc
Date: December 18, 2022 09:46AM

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


MGBV8
Carl Floyd
Kingsport, TN
(4562 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: Is this the problem with flat tappet stuff?
Posted by: MGBV8
Date: December 18, 2022 12:46PM

Friends don't let friends buy cheap lifters. :)
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mgb260
Jim Nichols
Sequim,WA
(2482 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Is this the problem with flat tappet stuff?
Posted by: mgb260
Date: December 18, 2022 01:09PM

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
Jim Nichols
Sequim,WA
(2482 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Is this the problem with flat tappet stuff?
Posted by: mgb260
Date: December 18, 2022 02:42PM

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
dave cox

(194 posts)

Registered:
04/30/2018 03:00PM

Main British Car:
SD1

Re: Is this the problem with flat tappet stuff?
Posted by: turbodave
Date: December 18, 2022 03:29PM

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
Jim Nichols
Sequim,WA
(2482 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Is this the problem with flat tappet stuff?
Posted by: mgb260
Date: December 18, 2022 03:47PM

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



turbodave
dave cox

(194 posts)

Registered:
04/30/2018 03:00PM

Main British Car:
SD1

Re: Is this the problem with flat tappet stuff?
Posted by: turbodave
Date: December 18, 2022 07:15PM

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
Jim Nichols
Sequim,WA
(2482 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Is this the problem with flat tappet stuff?
Posted by: mgb260
Date: March 20, 2023 04:30PM

Dave, Did you get your lifters back yet?


minorv8
Jukka Harkola

(271 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: Is this the problem with flat tappet stuff?
Posted by: minorv8
Date: March 21, 2023 03:49AM

Quality control ?

Comp Cams lifter straight from the box.

20210708_173241_small.jpg


turbodave
dave cox

(194 posts)

Registered:
04/30/2018 03:00PM

Main British Car:
SD1

Re: Is this the problem with flat tappet stuff?
Posted by: turbodave
Date: March 23, 2023 10:34AM

Hi Jim,
Yes, Powell turned them around in 2 weeks.
They look fantastic.
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ag1234
Arthur Gertz

(122 posts)

Registered:
03/29/2023 08:26PM

Main British Car:
Re: Is this the problem with flat tappet stuff=no roller
Posted by: ag1234
Date: March 30, 2023 01:41PM

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


Roverbeam
Chad McNeely
N.E. MO
(78 posts)

Registered:
06/09/2021 06:03PM

Main British Car:
Alpine S4 Rover 4.0

Re: Is this the problem with flat tappet stuff?
Posted by: Roverbeam
Date: March 30, 2023 05:34PM

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
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6508 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Is this the problem with flat tappet stuff?
Posted by: BlownMGB-V8
Date: March 30, 2023 07:33PM

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
Chad McNeely
N.E. MO
(78 posts)

Registered:
06/09/2021 06:03PM

Main British Car:
Alpine S4 Rover 4.0

Re: Is this the problem with flat tappet stuff?
Posted by: Roverbeam
Date: March 31, 2023 09:12AM

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
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6508 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Is this the problem with flat tappet stuff?
Posted by: BlownMGB-V8
Date: March 31, 2023 09:42AM

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


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