Martin’s PRV bone yard…

Ok will reveal all, but I want to first test some Venturi development heads for the LM series kindly loaned to me by Tommy, and possibly look at some flow development work so I have a full picture

Or are you guy's too impatient?

Cheers,
Martin

They're impatient ??? Screw them

FFS .......I guess we're back at the back of the queue even behind a C1J

Nooooo... heck you are worse than a woe-man! the 24V head is on the bench.. JIL 3ltr 12V heads are finished; just have the adaptor plates to do... see... Roller cam is in development for the 12V, and that is fairly expensive, well let's face it, it is expensive hardware - get a complete GTA for the same money in some cases... that's committed... the turbo for it is in build... Bottom end is all machined except the flywheel and clutch, and get the crank balanced. Ok?

The C1J is just a bit of fun, and I'm not starting that until I have the PRV stuff off the bench i.e. done and out the way, as I need to swap out the 93mm bore adaptor

Just fancied a moan ...

John Lane here from across the pond....

Yes; late to the party.

Nice work Martin!

I will make a point of paying attention to what you fellers are up to.

Forgive me.... I do find somewhat frightful that some of you are still using standard rods in a force-fed engine .... I got to partake of the joys of what happens when one fails.... The rest of them measured out 1-3mm shorter then when installed upon inspection of the remains.

Martin you speak of roller cam and 24 valve heads.... YUM!

I've just fit a N/A three liter to the 'Penalty Box' that will no doubt need more excitement in due time!

John Lane

and to add some colour ... the 24V Venturi PRV engine on racecars at the moment, thing worth noting as I mentioned above on water pumps is the lower pulley, reduction in size to drop the pump speed...



You can see it's using the OE lower section of the 24V inlet manifold, so this is not their full blown unit, but would be nice to see what the other internal detail is.

... just a nice little feature I've noticed in the sump, the two additional support posts at each side of the sump pan - stop the engine rocking over when you have it on the deck... great, why couldn't they had done that before...

Hi John

Great to hear from you on here... So are you n/a in your rally brick now then, why the change? Are you back out competing with it now? Post up some details and pics...

Thanks for the email, I'll get back to you

Here's some good pics to study from the cup car...



Noting the cold air feeds: isolated induction air feed, and heat extract from the turbo all still present to keep engine bay temps down. Even the dump valve air is plumbed out - hot air off the compressor pre-intercooler; not sure with that much kink in the hose it will actually work very well however... The grill also being retained to direct the air and improve the efficiency of the flow bend to the back of the intercooler… again good engineering by Renault.

Hi John

Great to hear from you on here... So are you n/a in your rally brick now then, why the change?

Oh my heavens Noooooo!! The Fire Breathing Monster shall always be Force Fed.

Are you back out competing with it now?

Sadly; no. Still needs more attention.... Turbo, a thousand details after replacing coachwork due to wadding it up in 2009. Life gets in the way.

Post up some details and pics...

Now you'll make me put a real effort into making it presentable!
The 'Penalty Box' is a daily driver for clients who leave a car with me which needs attention. It got an even-firing PRV three liter out of a Wrong-wheel drive Dodge with the ZF four speed automagic behind it. Shoved the engine back to the firewall like Volvo should have in the first place.... Did good things for how the car drives.... Gave it an automagic for clients to not get things wrong and a throttle body that doesn't shut down the fun at 3500. Having done that I can see that it needs more exciting cams to match it's throttle body and exhaust.... (I made it sound like a BringMuchWampum at higher revs.)

Now you'll make me put a real effort into making it presentable!

The 'Penalty Box' is a daily driver for clients who leave a car with me which needs attention. It got an even-firing PRV three liter out of a Wrong-wheel drive Dodge with the ZF four speed automagic behind it. Shoved the engine back to the firewall like Volvo should have in the first place.... Did good things for how the car drives.... Gave it an automagic for clients to not get things wrong and a throttle body that doesn't shut down the fun at 3500. Having done that I can see that it needs more exciting cams to match it's throttle body and exhaust.... (I made it sound like a BringMuchWampum at higher revs.)

Too right John, time to get it together! ... but I know you me both, life does get in the way, but I feel the trend of progress now

Your Penalty Box sounds great! Has it got good rubberised fenders on it as well and piddly little brakes?

24V heads, well yes they are pretty darn good out of the box, especially at low lift. As a bolt-on if you can find a good set without follower and cam issues, then no doubt the answer is get them on...

I'm still a 12V fan though, simply the rugged reliability of the cam rocker gear compared to the 24V, and the available options built up now in terms of cam choices that have been proven. 24V you are very much into uncharted territory again, and although it is tempting to find out and go the same route of having hardware made and then testing, I don't think I'll be going that route and picking up the tab as an individual only. I am at quite an advanced stage with a roller profile and setup for the 12V, and I think this will be sufficient to bridge the gap between the 12V and 24V head with a hydraulic profile. I will keep you posted, there are a couple of interested individuals, and this may make a group buy on some billet cams

Martin

Another week another dollar... hope the weather holds out

Where have all the fun threads like this gone:
http://www.renaultalpineownersclub.com/ ... r&start=75

Page 6 Tony's post, is your T38 turbo fitted with the RS500 compressor wheel, Garrett part number 409535-0007 Exducer 76mm inducer 56mm?

http://www.renaultalpineownersclub.com/ ... ins+father

How did this work out Chris, incidentally what are the specs of the Ferry cams you are using?
http://www.renaultalpineownersclub.com/ ... mance+cams

http://www.renaultalpineownersclub.com/ ... highlight=

http://www.renaultalpineownersclub.com/ ... highlight=

Stephen, the following link appears broken?
http://www.renaultalpine.co.uk/australia_visitors.htm

Whilst on old stuff, did Ross ever come back with any further information, is he still about, what happened to the car / engine in the end?

http://www.renaultalpineownersclub.com/ ... mance+cams

Martin

Well some more progress, another hybrid turbo has been built up, this time on a T34 turbine with back cut blades to stretch the top end a little further, pictures as below. Interesting thing is I have married it up with some OE header tubes with a lower flow loss, I believe these were only available to the Europa Cup - anyone advise otherwise? I have checked the A610 exhaust header hardware and it's the same size and mandrel forming as the GTA... These have been specifically formed to reduce flow losses in the bend, and hence heat losses too. Fitting them requires a change in the straight section tube, as it needs to be longer as the Europa Cup manual shows.

made my own offset dowels that you can turn to exactly degree up your cams . It required drilling the 7mm sprocket hole to 10 mm which gave you an allowance of 1.5 mm either side of its centreline.
And a screwdriver slot in the end of the dowel.

Hi Chris W, is there any chance of you making up a few? I would certainly buy some and pay for shipping if that were possible. My machining skills are somewhat self taught on a I need it now basis as I'm sure you have no doubt noticed

I had these on the bi-turbo, but both were fixed and would have not taken pressing back out kindly:

My machining skills are somewhat self taught on a I need it now basis as I'm sure you have no doubt noticed

Kinda like this

http://www.youtube.com/watch?v=P4qB6n1c ... r_embedded

skip the ads...

Excellent vid haha