Supercharging RV8 flapper
Discussion
I have a Range Rover Classic 3.5 EFi with flapper and Sprintex supercharger. The previous owner told me that it had never run with the supercharger. There is life in the old thing, but I'm confused re: engine breathers. The pipes are run into the plenum/throttle body similar to an NA car, my understanding is that this causes problems with breathing.
I'll get to the point (please!): where do the engine breather pipes for supercharged RV8 Wedges run to? Oil catch can? Atmosphere side of supercharger?
I'll get to the point (please!): where do the engine breather pipes for supercharged RV8 Wedges run to? Oil catch can? Atmosphere side of supercharger?
What is happening with the blower mechanically?
a) Is it connected to the crank with the drive belt?
b0 Does the engine air run through it?
If neither, then there must be a pipe bypassing it and I guess the throttle body is still remote from the plenum? The breather pipes go to just downstream of the throttle. The vacuum advance pipe goes to the throttle body too.
Some pics might help....
a) Is it connected to the crank with the drive belt?
b0 Does the engine air run through it?
If neither, then there must be a pipe bypassing it and I guess the throttle body is still remote from the plenum? The breather pipes go to just downstream of the throttle. The vacuum advance pipe goes to the throttle body too.
Some pics might help....
Sorry I understand now - you want to move the pipes to where they should be....
OK here's some pics of mine in that area, first note that the overrun valve on the plenum is a blanking plug:
The pipes for the extra air/overrun go to the atmospheric side of the throttle, the flame trap hose goes on the vacuum side of it.
OK here's some pics of mine in that area, first note that the overrun valve on the plenum is a blanking plug:
The pipes for the extra air/overrun go to the atmospheric side of the throttle, the flame trap hose goes on the vacuum side of it.
Thanks Adam, been a long slog with this.
Have re-jigged to something like your arrangement, engine runs but issues with CO or HC for MOT.
Could you please check the pipes marked on your photo.
Yellow (atmospheric) goes to a solid pipe that runs under the plenum but no connection to the plenum, then onto the idle air valve.
Red (atmospheric) appears to go to your flame trap on the passenger side rocker box cover?
Just out of view on the edited photo below (white arrow) is the other side of the idle air valve, connects to the vacuum side of the throttle body?
The engine breather circuit on mine doesn't appear to be complete: flame trap on the pass side rocker cover, pipe now leading to atmospheric side of throttle body, but no visible breather on the driver's side rocker box cover. Do you have a breather on the driver's side rocker cover?
Have re-jigged to something like your arrangement, engine runs but issues with CO or HC for MOT.
Could you please check the pipes marked on your photo.
Yellow (atmospheric) goes to a solid pipe that runs under the plenum but no connection to the plenum, then onto the idle air valve.
Red (atmospheric) appears to go to your flame trap on the passenger side rocker box cover?
Just out of view on the edited photo below (white arrow) is the other side of the idle air valve, connects to the vacuum side of the throttle body?
The engine breather circuit on mine doesn't appear to be complete: flame trap on the pass side rocker cover, pipe now leading to atmospheric side of throttle body, but no visible breather on the driver's side rocker box cover. Do you have a breather on the driver's side rocker cover?
Yellow (atmospheric) goes to a solid pipe that runs under the plenum but no connection to the plenum, then onto the idle air valve.
Yep. Except that it's the Extra Air Valve - for cold idle only.
Red (atmospheric) appears to go to your flame trap on the passenger side rocker box cover?
Yes but I think that isn't quite atmospheric, it's near the throttle body, so there will be a little vacuum scavenging.
Just out of view on the edited photo below (white arrow) is the other side of the idle air valve, connects to the vacuum side of the throttle body?
Mine doesn't have an idle air valve (unlikely on a flapper). The white arrow is pointing at the supercharger inlet.
The engine breather circuit on mine doesn't appear to be complete: flame trap on the pass side rocker cover, pipe now leading to atmospheric side of throttle body, but no visible breather on the driver's side rocker box cover. Do you have a breather on the driver's side rocker cover?
Yes but only the standard pinhole type with the little foam filter on top.
What are the CO and HC figures you are getting and at what idle speed?
Last MOT my HC was high and the tester revved it to about 2k and read it then.
Yep. Except that it's the Extra Air Valve - for cold idle only.
Red (atmospheric) appears to go to your flame trap on the passenger side rocker box cover?
Yes but I think that isn't quite atmospheric, it's near the throttle body, so there will be a little vacuum scavenging.
Just out of view on the edited photo below (white arrow) is the other side of the idle air valve, connects to the vacuum side of the throttle body?
Mine doesn't have an idle air valve (unlikely on a flapper). The white arrow is pointing at the supercharger inlet.
The engine breather circuit on mine doesn't appear to be complete: flame trap on the pass side rocker cover, pipe now leading to atmospheric side of throttle body, but no visible breather on the driver's side rocker box cover. Do you have a breather on the driver's side rocker cover?
Yes but only the standard pinhole type with the little foam filter on top.
What are the CO and HC figures you are getting and at what idle speed?
Last MOT my HC was high and the tester revved it to about 2k and read it then.
Edited by adam quantrill on Thursday 23 October 18:43
Thanks Adam, poor description on my part, extra air valve for use when starting from cold.
Pipe marked white is the other side of the extra air valve to vacuum side of throttle body?
3.5% CO but 2000HC and climbing, can trade lower HC for higher CO.
Edit: I'll recheck, but I can't find any breather on the driver's side rocker box cover, there is a breather on both rocker box covers on my flapper TVR.
Pipe marked white is the other side of the extra air valve to vacuum side of throttle body?
3.5% CO but 2000HC and climbing, can trade lower HC for higher CO.
Edit: I'll recheck, but I can't find any breather on the driver's side rocker box cover, there is a breather on both rocker box covers on my flapper TVR.
Yeah that's correct but even so it won't affect your CO or HC as the EAV is only open for 12 seconds and that's it.
Mine has a plastic slug where the overrun valve is.
How is your compression? Have you changed the oil if not stick in some fresh 20W/50.
What RPM are you running at idle? I set mine for 1100 for the MoT that's allowable.
Mine has a plastic slug where the overrun valve is.
How is your compression? Have you changed the oil if not stick in some fresh 20W/50.
What RPM are you running at idle? I set mine for 1100 for the MoT that's allowable.
Thanks Adam. Oil is fresh, compression unknown but no blue exhaust smoke, heavy breathing or clanking noises. Idle is about 750rpm, will increase to 1100. Was your CO checked at 1100 and HC checked at 2000?
I'll need to create a breather for the driver's side rocker box cover. The oil filler is fitted on that side so might be able to do something with that. Any thoughts on the diameter of hole required?
I'll need to create a breather for the driver's side rocker box cover. The oil filler is fitted on that side so might be able to do something with that. Any thoughts on the diameter of hole required?
V8 Fettler said:
Ta, RR is an auto hence idle speed 750 to 850
Ahhh - got you, above 900 rpm or so the auto box will start pulling in 1st. In that case what you need is a manual transmission. As luck would have it, I have a complete working Rangey 5-speed LT77 with transfer box. It came off my 4.3l '86 Rangey. Interested?Also - this engine was OK on emissions before the supercharger was connected up, wasn't it? Just wondering.
Edited by adam quantrill on Friday 24th October 07:58
Gassing Station | Wedges | Top of Page | What's New | My Stuff