Rover V8 Rhoads Bleed-Down Lifters
Discussion
Anyone tried these "Rover V8 Rhoads Bleed-Down Lifters" ? Read loads on PH about the dreaded bag of marbles rattle on overrun? do they help stop it?
According to 'V8Tuner' the Bleed Down lifters give increased low end performance due to reduced overlap and lift and revert to STD above 3500rpm.
Gives better mpg on small throtle openings
Enables the use of more radical cam profile and yet maintains street drivability.
Suitable for 3.5 to 5.0 litre engines
I was thinking of fitting them in my 5 litre Griff with a Stealth cam, thoughts anyone?
According to 'V8Tuner' the Bleed Down lifters give increased low end performance due to reduced overlap and lift and revert to STD above 3500rpm.
Gives better mpg on small throtle openings
Enables the use of more radical cam profile and yet maintains street drivability.
Suitable for 3.5 to 5.0 litre engines
I was thinking of fitting them in my 5 litre Griff with a Stealth cam, thoughts anyone?
blitzracing said:
As I understand them, they bleed down at lower RPM, and thereby open up valve gap, that makes the engine sound like a bag of spanners as you say anything below 3500 rpm- or 95% of your driving time then.....
I dont think they bleed when the lifter is down....Basically at a slow rate / pressure they don't fully lift when compressed (at top of cam lift) ~ valves still shut, follower maintains pressure on pushrod - just dont fully open AIUI.
spend said:
I dont think they bleed when the lifter is down....
Basically at a slow rate / pressure they don't fully lift when compressed (at top of cam lift) ~ valves still shut, follower maintains pressure on pushrod - just dont fully open AIUI.
Sorry spend, being dim & I was looking at these too…. What does the explanation mean in layman's terms? Is it an advantage? I regularly experience valve train rattles coming off track after a sprint/hillclimb- would these lifters cure this? Already got baffled sump/windage tray & YT roller rockers.Basically at a slow rate / pressure they don't fully lift when compressed (at top of cam lift) ~ valves still shut, follower maintains pressure on pushrod - just dont fully open AIUI.
griffdude said:
spend said:
I dont think they bleed when the lifter is down....
Basically at a slow rate / pressure they don't fully lift when compressed (at top of cam lift) ~ valves still shut, follower maintains pressure on pushrod - just dont fully open AIUI.
Sorry spend, being dim & I was looking at these too…. What does the explanation mean in layman's terms? Is it an advantage? I regularly experience valve train rattles coming off track after a sprint/hillclimb- would these lifters cure this? Already got baffled sump/windage tray & YT roller rockers.Basically at a slow rate / pressure they don't fully lift when compressed (at top of cam lift) ~ valves still shut, follower maintains pressure on pushrod - just dont fully open AIUI.
Your rattles sound more likely crap valve train geometry or oil issues IMHO, whether shaft springs letting rocker arms wander up & down the shaft (& pushrod clips hole in head) etc / hot run - ease off oil pressure drop whilst heat expansion still at max? Just go solid at least you can rotate the engine and get a good idea where all the valve train components are moving/tracking as for rattles never seen any installed properly make as much noise as hydraulics?
Read so much stuff on this topic, lots of us with the same issue, I think as suggested above, ensuring the pre load is correct or conversion to solid lifters might provide the solution. Looking to tackle this end of summer, so will report back later. Thanks for the input guys, this is a great forum!
I've always suffered from rattly lifters on TDs.
This occurs as pressure drops usually on tight corners as engine oil gets very hot, oil like water, sticky tyres give max G and you back off the throttle.
As you throttle on, the lifters take a while to pump up and you hear rattly lifters for a few seconds as the oil plays catchup.
Strangely, after I made the following changes I had no issues at all yesterday at a TD even though I was "full on"!
Bigger baffled sump
Change to Shell Helix 10/60 Motorsport oil.
This was amazing as the oil temp rose to 118 degrees!
You could tell the improvement by the digital oil pressure gauge.
Last TD oil pressure was dropping dramatically on high G bends with a hot engine but now I never saw less then about 35 psi under at least the same conditions.
This occurs as pressure drops usually on tight corners as engine oil gets very hot, oil like water, sticky tyres give max G and you back off the throttle.
As you throttle on, the lifters take a while to pump up and you hear rattly lifters for a few seconds as the oil plays catchup.
Strangely, after I made the following changes I had no issues at all yesterday at a TD even though I was "full on"!
Bigger baffled sump
Change to Shell Helix 10/60 Motorsport oil.
This was amazing as the oil temp rose to 118 degrees!
You could tell the improvement by the digital oil pressure gauge.
Last TD oil pressure was dropping dramatically on high G bends with a hot engine but now I never saw less then about 35 psi under at least the same conditions.
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