anyone try these yet? im curious how the extra weight would benefit or what the advantage would be.....



http://www.jhpusa.com/catalog/...66a75

 

no but look great as long as you keep an eye out for abnormal wear

 

It states they are up to 20% lighter than the titanium retainers.

 

how much for the supertech alluminum retainers with keepers?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by all-mtr-teg &raquo;</TD></TR><TR><TD CLASS="quote">how much for the supertech alluminum retainers with keepers?</TD></TR></TABLE>

you couldnt click the link in the first post?

 

are these better than using chromoly retainers with stock keepers

 

for a track car that sees a couple of passes before a rebuild, maybe. for X thousand miles on a street car, no way!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bluedlude &raquo;</TD></TR><TR><TD CLASS="quote">for a track car that sees a couple of passes before a rebuild, maybe. for X thousand miles on a street car, no way!</TD></TR></TABLE>

I agree, too soft for daily use.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Natural Aspirations &raquo;</TD></TR><TR><TD CLASS="quote">

I agree, too soft for daily use.</TD></TR></TABLE>

We have over 80k on alum retainers in 400whp turbo cars

The key is low spring press about 55 @ the seat and 185 open
and 9000 RPM limit ..
I have built probally 75 heads with alum retainers and only had One break that i know of..

 

OH yea FYI .. Factory Motorcycles like SUZ bussa and KAW ZX-10
have had alum retainers for along time

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MAX_CFM &raquo;</TD></TR><TR><TD CLASS="quote">We have over 80k on alum retainers in 400whp turbo cars

The key is low spring press about 55 @ the seat and 185 open
and 9000 RPM limit ..
I have built probally 75 heads with alum retainers and only had One break that i know of..</TD></TR></TABLE>



People think aluminum and they think of a coke can, therein lies the problem.

 

honda even used aluminum retainers in the first gen b16a automatic motors. its nothing new but nice to see supertech offer them.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Runnerdown &raquo;</TD></TR><TR><TD CLASS="quote">honda even used aluminum retainers in the first gen b16a automatic motors. its nothing new but nice to see supertech offer them. </TD></TR></TABLE>

Thats right i completely forgot about that. I have it on good authority this was a cost saving move by Supertech with the price of Ti rising lately.

 

Just to add more information about these. I have this valvetrain for some new K20A cams I have. ***** Tagliavini at Supertech said that they should last longer than titanium retainers with an installed height of 1.565" (stock K-series Installed height) @ ~80 pounds seat pressure, ~280 pounds at about .500" lift. I guess we will find out how they do.

They weigh ~5.162 grams each FWIW.

Pirate


Modified by PirateMcFred at 3:39 PM 5/19/2007

 

I am about to try these on the "dyno" mule. They have 10 degree keepers, stock keepers will not work. Willi likes them better than Ti, and as he sells both, I will stick with his opinion.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DonF &raquo;</TD></TR><TR><TD CLASS="quote">I am about to try these on the "dyno" mule. They have 10 degree keepers, stock keepers will not work. Willi likes them better than Ti, and as he sells both, I will stick with his opinion.</TD></TR></TABLE>

let us know how they hold up don

 

that valve is going to have to sit deep or do some custom lower retainer milling. that install height is tall. usually i see around 1.340 or so.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1 2 NV &raquo;</TD></TR><TR><TD CLASS="quote">that valve is going to have to sit deep or do some custom lower retainer milling. that install height is tall. usually i see around 1.340 or so.</TD></TR></TABLE>

Good call I thought that number was off, but not up on every spec.

 

Whats the keeper degree affect? Nothing?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Aquafina &raquo;</TD></TR><TR><TD CLASS="quote">Whats the keeper degree affect? Nothing?</TD></TR></TABLE> Contact area between the retainer and keeper, larger load area.

 

So less chance of the keeper walking out?

 

I bought a set when day came out and they are the **** the 10 degree keepers make the retainer lock even better than the stock size I'm happy with them I also bought their turbo springs, coated dish valves, and bronze guides my head internal is all SUPERTECH

 

i rather like those but my budget is spoken for...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1 2 NV &raquo;</TD></TR><TR><TD CLASS="quote">that valve is going to have to sit deep or do some custom lower retainer milling. that install height is tall. usually i see around 1.340 or so.</TD></TR></TABLE>

Sorry. I should have been more specific on my applicaiton. I have a K20 that will be running 13mm+ lift cams. 1.565" is supposeldy the stock installed height for K-series. So B-series will have a shorter installed height. I will edit my above post.

Pirate

 

thats good to know, thanks for the clarification.