Clutch lightening Servo - BEWARE

[QBee]

My clutch servo has worked just fine with no vacuum pump.
Cam was a V8D Stealth cam, and now it's a basic mild Range Rover cam.
Phazed's cam is very aggressive, I believe.

[phazed]

sidewaysste said:

Sorry! yes you were.
I'd also have thought that using the mityvac to drag vacuum should have made the servo work even if the engine couldn't pull enough vacuum?

Absolutely correct.

Switch on ignition, pump runs and I have vacuum before the engine starts.

I have two separate vacuum feeds to the plenum, brake and clutch. As the vacuum is marginal for the brakes, (not a problemas yet) I am going to experiment with a tee piece to the vac pump.

[N7GTX]

I doubt a standard Mityvac could pull enough to move the large diaphragm. Remember, the outlet from the plenum base is a much, much larger bore than the tubing for a Mityvac.

When bleeding diesels using a Mityvac, it is often impossible to drag the fuel through. It won't do a Focus 2.0 diesel for example. You have to use a proper hand primer pump to pull the fuel up.

You could fit the Mityac to the plenum and run the engine at idle to see what vacuum the engine is actually producing?

[sidewaysste]

Vacuum's vacuum, surely?

I was under the impression that the vacuum servo reservoir should be large enough for 3 or 4 applications so if the mityvac has pulled enough vacuum then flow rate shouldn't matter?

regarding bleeding systems, diesel is a lot more viscous than air and the flow rate of a mityvac is small, that's why you need a pump for that.

I actually have a vacuum/boost gauge in the vehicle already, I just don't have any free vacuum ports on the inlet manifold...

[phazed]

Try a tee piece.

[sidewaysste]

Sorted. The original vacuum servo was faulty. The replacement works fine.

[Sardonicus]

Great result

[QBee]

I have never had this with any other car, but the rule for problems after fitting new parts to a TVR seems to be

"Always suspect the new parts you have just fitted, before you start to rip the car apart looking for why it (still) doesn't work"

[Sardonicus]

This servo is a rip off/ repro/copy of the original Lockheed design so.......

[sidewaysste]

Yeah, I know. Buy cheap, buy twice. It was as much about proof of concept though. It wasn't until I'd fitted it that I found out others had the same idea.

Is it actually possible to buy the original Lockheed or girling servos?

[QBee]

The one in my car is from an MGB. Worth a call to the MGBHive (01945 700500) or Rimmers (01522 568000). In my experience both are happy to answer questions, and Rimmers are used to TVR owners, as they supply loads of RV8 parts.

[Sardonicus]

sidewaysste said:

Yeah, I know. Buy cheap, buy twice. It was as much about proof of concept though. It wasn't until I'd fitted it that I found out others had the same idea.

Is it actually possible to buy the original Lockheed or girling servos?

Wasn't insinuating it was rubbish just that it is a reproduction of the original part (no longer available) and Lockheed probably invested far more in development, quality control and material quality etc , many have used this with great success on clutch and brake functions to date

[jazzdude]

QBee said:

The one in my car is from an MGB. Worth a call to the MGBHive (01945 700500) or Rimmers (01522 568000). In my experience both are happy to answer questions, and Rimmers are used to TVR owners, as they supply loads of RV8 parts.

^ this

I have had mine running now for over a year, no problems and by far one of the most sensible mods I have done to this car. No loss of feeling in the take-up but so much more forgiving in traffic.

Apart from fluffing around trying to get it to sit at the right angle where my carbon canister used to be in the nose, it is a simple install.

[QBee]

jazzdude said:

QBee said:

The one in my car is from an MGB. Worth a call to the MGBHive (01945 700500) or Rimmers (01522 568000). In my experience both are happy to answer questions, and Rimmers are used to TVR owners, as they supply loads of RV8 parts.

^ this

I have had mine running now for over a year, no problems and by far one of the most sensible mods I have done to this car. No loss of feeling in the take-up but so much more forgiving in traffic.

Apart from fluffing around trying to get it to sit at the right angle where my carbon canister used to be in the nose, it is a simple install.

Phazed got around the fiddly front corner bit by simply carving a large entry porthole into the front front of the the front right wheel arch to fit it, and then turning the cut out into a cover when he had finished. I am sure he has pictures and will post them if he spots this post.

[jazzdude]

Mine had the headlight hole and I had the rad out at the time so I also worked from the front, but a bigger hole in the wheel arch would have been better.

[citizen smith]

jazzdude said:

QBee said:

The one in my car is from an MGB. Worth a call to the MGBHive (01945 700500) or Rimmers (01522 568000). In my experience both are happy to answer questions, and Rimmers are used to TVR owners, as they supply loads of RV8 parts.

^ this

I have had mine running now for over a year, no problems and by far one of the most sensible mods I have done to this car. No loss of feeling in the take-up but so much more forgiving in traffic.

Apart from fluffing around trying to get it to sit at the right angle where my carbon canister used to be in the nose, it is a simple install.

I am now on my second Chimaera with this mod and have never had any problems, plus it's a non invasive fitment - no servo assistance required.

[SILICONEKID 357HP]

I'm not sure what you have actually done .

[debaron]

SILICONEKID 357HP said:

I'm not sure what you have actually done .

If you make an strong L bracket you increase the amount of leverage done by your foot

By moving the clevis pin closer to the clutch pedal mount bushing - hence lightening clutch feel.

Go take a look at your clutch pedal and you'll see the difference to what's in the photo

[citizen smith]

SILICONEKID 357HP said:

I'm not sure what you have actually done .

A simple engineering solution, that overcome a heavy clutch problem for me. Less complicated than a servo.