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83mm

It has a higher knock resistence than petrol, but a lower calorific value....hence it would like higher Cr, and returns lower MPG. Also because it provides no lubrication to valves etc, who knows on long term effects of constant use. I know with my old LPG van, it ran best if i done...

what is your new bore diameter?

ok,,,,remember, im right until proven wrong :p

oh and did you get the pics of that head Danny?

or simply: they help control valve movement more acurately at higher engine speeds. They are also required when std items become coil-bound near full lift.

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yup...im basing what ive said on my experiences of these engines. ALL the heads ive seen (and thats a fair few, of all ph's's) have been CNC'd on the inlets.

yup thats typical of any forum. Like I said, i'd be intrested to see pics when you have a camera to hand.

wooo woo less of the attitude lad. get some pics up on tues.

are you talking about inlet ports or exhaust ports?? Im talking inlet.....

im wrong that YOU have a head with altered ports, OR im wrong that Renault DIDNT CNC all heads? Theres a difference....

I'd say thats more likely where someone has made an attempt at improving flow. Ive got various early/late heads kicking about my workshop...ALL CNC'd. They were CNC'd from the factory.

They were all CNC'd from Renault mate. whats the "un-ported, semi-ported, fully ported" about? The CNC operations on any head arent necessarily about flow gain, its more for repeatability between ports and between heads, especially on a mass-produced basis from a manufacturer such as renault.

Get some pics up.

They are all CNC machined ports...

its often worth spending that lil extra to get a better end result though mate....

exhausts pop when you go LEAN on over run...

I think people are confusing bio-diesel, with a diesel/vegetable oil blend. Bio-diesel is veg oil which has had the glycerine removed by a process involving ethanol...this is fully safe as its the glycerine which blocks injectors and fuel components. A diesel/veg blend uses 10-50% diesel...

It only takes a couple of thou to cause a knock....there wont be any valve hitting piston action!! If its a bottom end knock, thats enough of an issue on its own... Get some vids up of it fella...

ah.... big-end type knock?? Cant be heard untill say 3-4000 rpm when static, or under load when driving.

Those compression figures arent too bad...there will be a bit of variation innitially until the followers have taken up the lash. Try it again after its ran for a bit. Well done mate btw! I bet your bouncing... :)

400 rpm? Power delivery is far more instant that with a plenum/single throttle. And since torque is increased throughout the whole rev-range, they "pull" alot harder. Any "kick" is really going to be determined by your cam profile and timing figures.

pistons!!!

LMAO!!!!!

^^^100% agreed. Leaves nothing to chance if every component is up to scratch, especially if the engine is in bits anyway.

dont hammer it out, unless your confident, they can stick on the ally if your not careful. if in doubt take it to a machine shop, and they will press it out and the new on in with ease.

all you know thats wrong with it is a broken valve. shoddy workmanship is apparent mate, you will be very gutted if after spending ££ on fixing it, it starts knocking its t**t off because the oil clearances werent checked after it was ground.

get the head in a dark room, put a torch in each port, and see if yo can see light from the chamber side. Or pour parafin in the chambers with the head up turned. At the risk of fixing what could well be an otherwise dodgey engine, I would find a running unit. At a cost of 300-400, its...

LOL very comparable example! Im basing it on money spent on a conversion compared to equalish money spent on some jap car... I'd put my money on the clio anyday. plus it will put a bigger smile on your face.