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Turboing a R19 valver



  Clio RS 172


As the topic shows im turboing my 19 16V. Found a donor engine, a GT22 turbo (with T3 housing AR60), making a manifold my self (gonna look like the BB one without inlet for the external wastgate since this is on the turbo as standard.

Im going for a spesso kevlarheadgasket 1,6 mm lowering to about 9,2:1 on standard pistons. Then i was looking at other pistons, and found out that the Megane Coupe 2,0 16V and the willy pistons are also lower than the original valver pistons. My question is now. Will these pistons be able to handle 250 bhp? If no.. any one knows which pistons to buy? (e.g. serialno. og fabricno.? to ease my pain). Also what clutch to choose since the standard will hold to about 200 lbs i need something bigger to hold the line. Looked at OMP torision, and rigid which seems fair in price. Anything else that would be recommended?

The last thing will be the box which naturally should be a willy box. Also looked at another JC5 box from a megane Tdi which might do the job. And is a lot high ration.

My standard JB3 box dies at 155 mph with the new chip which revlimits at 8200 rpm. ive seen 142 mph on the revmeter (7300 rpm) which was 145 mph on the clock. (pretty good on an almost standard valver hehe!).

Basically i need some help from you guys! Hopefully my car will be done in the late summer since it will need a complete rebuild in the engine.
 


Quote: Originally posted by |sAs| on 08 April 2004

Then i was looking at other pistons, and found out that the Megane Coupe 2,0 16V and the willy pistons are also lower than the original valver pistons. My question is now. Will these pistons be able to handle 250 bhp? If no.. any one knows which pistons to buy? (e.g. serialno. og fabricno.? to ease my pain).
The Williams/ megan 2.0 pistons are wider than th16V ones so youd need to fix that by buying a 2.0 block or having you present blcok bored out

Custom made pistons from ROSS. Or http://www.ariaspistons.com/http://www.ariaspistons.com/ . Or JE

Otherwise the other choices are dished 16V one and a thick head gasget (spesso 1.6mm) good for about 0.7 bar.

You may want to think about new piston rods for high pressure applications

Clutch from http://www.sachs-race-engineering.de/http://www.sachs-race-engineering.de/ or ask Nick Read on here his 250hp one has a modifed clutch
 
  Clio RS 172


Thanx guys, About the megan pistons, yeah they are 0,7mm wider. Which shouldnt be a problem since i will have the donorengine bored to get full compression on every cylinder. I read somewhere that the pistonrods are titanium enhanced and since they are H-type i dont think they would need replacement ;) but ill find out. Accrelite and TG from sweden makes custommade pistons also. But i was looking for som pistons that fitted right in the 82,0 mm bore or the 82,7 mm bore. :)

Keepem comming :)
 
  BMW 320d Sport


Williams clutch will be no good, The second clutch I had burnt out fairly quickly after the turbo conversion although this was also down to a gearbox failure. At the moment its onto its second kevlar clutch, the first was a standard pattern job with kevlar facings, the current one is a paddle pattern. Same as the one BB sell, the TZ Kevlar job.
 
  Clio RS 172


Nick, sounds like a lot of of clutchs. And sounds to me that your the one i need to talk to about this project. Do you know if the megane (82,7mm) pistons will do for turbocompression af the boost of 1,1 bar? Or do you maybe know which pistons are used in the BB conversion (i think Andy said JE pistons, but i know that Fastchip used Mahle... could you maby give out a part number?)

Fred:
JC5 box on the 172? Are you sure Fred? And are you sure the ration is higher than the JB3 box? If thats true then that might be a posebility

- So fare great help from you lot
 
  5, 19, Integrale, Cupra R


Ive a set of forged low compression williams pistons (82.7mm) for sale, £400 delivered. I was goin to use them in my 19 (im the chet mentioned above!) email me at mailto:chet@renault-turbo.com">chet@renault-turbo.com

These will take all the punishment you can throw at them!
 
  Clio RS 172


Ummm nice!! Chet... yeah i figured you where the one. I need to save up some cash to buy them off your hands. But im very interested. (mail you asap going away to a funaral this weekend so might not be before monday).

Cheers!
 


Quote: Originally posted by |sAs| on 08 April 2004

Nick, sounds like a lot of of clutchs. And sounds to me that your the one i need to talk to about this project. Do you know if the megane (82,7mm) pistons will do for turbocompression af the boost of 1,1 bar? Or do you maybe know which pistons are used in the BB conversion (i think Andy said JE pistons, but i know that Fastchip used Mahle... could you maby give out a part number?)

Fred:
JC5 box on the 172? Are you sure Fred? And are you sure the ration is higher than the JB3 box? If thats true then that might be a posebility

- So fare great help from you lot
The willy/megane pistons or even the 172 pistons will take the boost, but id check the compression height first, i cant remember but i think its much higher and that would result in too much fo a compression ratio drop.

Jc5 is in the 172 yes.

Id just plump for some dedicated low comp pistons. They will be stronger, thier expansion coefficient and taper will be machined with turbo use taken into account. The crowns will be thicker etc etc. WIth modified std pistons you run the risk of making the crowns too thin or just machining through them, poor combustion floor shape and wont be able to take as much boost in the long run.
 
  Clio RS 172


Ben.. checking the hight of the pistons thuesday to find out how much highe the pistonpin is on the F7R pistons. (What size are 172 pistons??). The standard F7P pin hight should be 34,45 mm from pin center to top. All i need is 2 mm from that and im at about 8 in compression. Adding the spesso headgasket will get me til 7,2-7,5:1 which should be very neat at 1,1 bar. And should last the blast.

So fare very usefull info. Its gonna be so fun building this machine. And even more fun puting it in the car. (Just to bad i cant pass the danish MOT with this engine...)

Happy easter folks!
 
  BMW 320d Sport


I thought they were JE. Anyway they are definitely low compression, 7.5:1 with a slight overbore to bring the capacity up to almost 1800 rather than 1764cc. As Ben says, if you want to do the job properly, get the right pistons rather than modding Megane ones. Especially if youre thinking of starting off with 1.1bar. Thats a pretty thick head gasket to bring the compression down to 7.2:1!

Anyway, this thread got me to thinking about gearboxes. Now if the Williams and 172 boxes are both JC5 then what is the difference in their gearing and final drive? By my calculations, mine with a Williams box, with enough power will run up to around 150-155mph before hitting the limiter. Now if I can lengthen the gearing with a 172 box that would be very handy. So the question is, is the 172 box longer?
 


more than 150mpg is handy! lol.....

7.2:1 is a very low CR, even for a simple 1 bar boost.

172 pistons are teh same size as F7R pistons, but they have a neat dish.
 


you want 7.5 comp really running 8v pistons je about 40 notes each with rings and pins paddle clutch and uprated diff and lock rings standard gasket wire ringed block good for 25 30 psi
 
  Clio RS 172


Quote: Originally posted by MAXIBOY on 09 April 2004

you want 7.5 comp really running 8v pistons je about 40 notes each with rings and pins paddle clutch and uprated diff and lock rings standard gasket wire ringed block good for 25 30 psi
8V pistons from JE? ive contaced JE and was told they had only R5 turbo pistons for renault. And at that price it seems like a prayer was heard ;) But still the pistons Chet has show are REALLY nice looking. And they are as Nick wrote for a bore 82,7mm which brings it up to about 1,8L in the enginesize. Im not driving a standard gasket on a charged engine. It will certainly be the spesso 1,6mm.

About the diff, clutch. I think ill have to contact Nick for som info on that. First i need the engine made, the rest will come eventually.

You guys made my easter a very happy one. Great to some helping hands along the way when i need to find the right pieces from the beginning.
 


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