Manley Type IV Racemaster Valves

[michla]

Manley has taken a wrong turn!

I phoned them last week asking about their NEW single-keeper groove Type IV valves--a true departure from typical production that has been the VW 3 groove keeper configuration which they no longer offer.

I asked the tech on the other end of the phone what single-groove keepers they recommend for Type IV applications and he didn't have any recommendations. Which leaves the pervasive question: if their going to depart from stock-specified valve retention then they should be able to recommend a suitable keeper?

Why Manley? Because they're the lightest stainless valves in the marketplace and I'm all-out race (no can do Titanium for the cost)

Does anybody here have any experience with 7-degree single groove 8mm keepers ? I'm not finding much out there.

[modok]

the keepers are on page 55
13094-16 16 pr. 8mm (.3135”) Single Radius Chevy LS, LT1 (.050”)
13098-16 16 pr. 8mm (.3135”) Single Radius Chevy LS, LT1 (Std.)
13095-16 16 pr. 8mm (.3135”) Single Radius Chevy LS, LT1 (.050” more)

here is the catalog
http://www.manleyperformance.com/dl/cat/catalog.pdf

[wheel607]

Just a note......Manley in my opinion hasnt been any good for a few years now. You see when I built a set of type 1 heads I just said Manley valves. Boy, was I ever wrong. You see, Manley buys ASIAN valves it sells to vendors and doesnt even tell them why their price is cheaper. The valves made by Manley in the US are far superior with stretch and are usually back ordered. You have to order right then WAIT. They are about $15 each, more, when you can get them. I feel Manley has pulled a flim flam by not telling the customer this. You assume that all the valves are made in the USA.......not true. Maybe, if it matters to you, you should ask Manley where these type 4 valves are made.

[modok]

Keepers are like a collet....only fits a narrow range of size correctly.
Most problems I have seen with keepers.... have to do with the keepers not matching the size of the valve stem.

But far as the retainer..... 7 degrees is 7 degrees, so rarely any problem with that side, tho might sit higher or lower depending on what parts you mix.

[Dan Ruddock]

The Keepers will most likely will be the larger O.D. and not fit standard VW three groove retainers. The retainers CB sells to fit their single groove keepers are boat anchors at 22 grams. I don't like the direction the market is going with the single groove design.

[VWporscheGT3]

[michla]

great comments as I don't have word-of-mouth up here to rely on. The marketplace is changing so fast and I am outside the fringe of communication with other consumers in our industry so this really helps, just wish we had more choices anymore. I got a set of Type IV valves from Scat awhile back but never used them because they were quite a bit heavier. Rely on valve head mass for strength rather than alloy?--a big problem at 7500rpm!

Something else I'm considering: has anyone tried using 5/16" spring retainers instead of 8mm? Alot more choices/quality available in the aftermarket for 5/16. So long as they're wedged with 7 degree 8mm keepers, right?

[bugguy1967]

I'm using PAC retainers and locks on my Manley single groove valves. The retainers fit on some springs without mods, while a few options require some lathe work to narrow the outer step.
_________________
"A petrol engine can start readily, run smoothly and give every appearance of being in good order, without necessarily being in good tune." - Colin Campbell, "The Sportscar Engine"

[michla]

[michla]

[michla]

[Dan Ruddock]

I always grind VW keeper so the valves spin very little or not at all. Solve’s a more important problem than wether valves spin or not. Of coarse on a stock engine I leave them alone but I don’t build stock engines anymore so I always grind them now.

[RCP Phx]

You might want to read this thread as I went thru something like this with a ton of research!
https://www.thesamba.com/vw/forum/viewtopic.php?t=764374&highlight=

[michla]

[michla]

[Wreck]

[Jason37]

Guess I got lucky, ordered blindly last year.

[bugguy1967]

It's PAC L8142-16 lock. The retainer is titanium - PAC R550
_________________
"A petrol engine can start readily, run smoothly and give every appearance of being in good order, without necessarily being in good tune." - Colin Campbell, "The Sportscar Engine"

[michla]

[michla]