Any body used these lifters

http://www.hughesengines.com/Index/produ...mp;partid=26197

What kind of life time could i expect of them combined in a street engine with recomeded valve springs and about 580 to 590 in lift on 1.6 rocker ratio ?

They should last for more than 200 000 kilometers.

They are similar to what is standard in most US pushrod engines, except for the links. Hydraulic roller lifters usually go indefinitely. Some of the higher performance engines are using lifts that high, although with rocker ratios in the 1.8 range.

I don't think you'd be able to wear them out, unless you can afford a million Euros of gasoline.

R

Thanks R The gas price is very high around here so i gues your right about that !

They are made by Morel I think--better quality than the Comps. I have used several sets--you have to be very careful with spring pressure--Dave at Hughes can help on that--It is easy to get into trouble if you over rev an engine with these--they are heavy so much above 5500 RPM and you can spit out a pushrod or float valves--I am sure some have combos that turn more and have been OK but our experience is better to keep RPM reasonable--they just can't control everything as well as other styles of lifters. Comp brand hyd rollers for big blocks have had issues, sticking plungers comes to mind. They may be using these by now--I don't know but Morels are good.

I have the valve springs recomeded from Hughes for those lifters but my rev limiter whent bad on me so i had a short valve float but nothing bad happend other then the bad noice when it over rev´d ! Im 99,9 percent shore that the valves dident hit the pistons becas i have realy good valve clearence.

I am using the Hughes Hydraulic rollers in my street 505" stroker. Basic 440 source 4.25" stroker kit with 7.1" rods, 17cc dished pistons, ported stealth heads (about 10.3:1 compression.) The cam is the Comp XR286HR-10, 236/242@0.050", and I'm running 1.7:1 rocker arms for 0.617"/0.614" lift.
Because of the higher lift, I decided to use the Isky 8005A valve springs, with Comp cams 748-16 retainers and 10-degree locks. The Isky spring is just a tad stiffer than the recommended Comp 925 springs. Isky spring rate is 400, Comp is 395, Isky seat pressure is 135, Comp is 111.
The engine revs pretty good and I have not noticed any valve float. I installed a Crane HI-6 with the rev limit set to 6,000, but I should bring that down to about 5,500?
I did notice more valve train noise on startup, but it seems to quiet down after startup, but the noise may be my cheap 1.7:1 rockers? I put a few hundred miles on the new engine last year, and I am planning to pull the valve covers to inspect the rockers and re-adjust them. I may also replace the stock steel valve covers with taller aluminum covers because my PCV valve is picking up some oil.

Same stroker kit in my engine but flat top pistons and ported RPM heads and a tad more nasty cam but 1.6 rocker ratio ! What preload are you aplying to your lifters and what oil are you useing ?

I wouldn't run those i have had much better luck with the Comp Hyd rollers! They will take the kind of spring pressures you need for a good street cam

if you are running under 6500 rpm hydraulics are fine. some manufacturers claim their lifters will run past that due to high tech engineering, but i would not trust that. you dont want your valves floating at high rpms... anything over 6500 you should be running solid lifters or solid roller lifters.

http://www.enginebuildermag.com/Article/95409/hydraulic_camshafts_and_lifters_101.aspx

roller versions are the best at high lifts / high spring pressures. they cost more to set up (machine work, blueprinting) but they definitely work better if you are going over .600 lift. generally you see the benefits of such high lift at higher rpm ranges anyways...