hotgolf m8 do you wanna comment again when your not legless because thats great! i know about the forged piston and solid lifter noises/oil use,as a m8 runs this spec in an xe lumped mk2 escort,good to hear it confirmed again and i dont mind the oil use and noise,its how all cars should be is there a wildest cam you can go on hydrauilc? carbs and pre-chopped jew Edited by: riley
That's good - I made very little sense at first! Good advice. I should have said this aswell, as it ties in with what I was saying, as obviously lighter bottom end means less inertia aswell, so this is largely why I don't want a very light flywheel as my motor is very light (sounds like Neil's will be too) - though this is a bonus at high revs - god, you have to love the whipcrack response at big rpm, truly to die for
34mm inlet and 28.5mm exhaust is the proven combo. Should add at least 10 peak hp over a 'normal' ported head on stock valves, if not 15. I'd only bother if you're going to rev past 8,000rpm regularly, otherwise, it's quite a lot of extra money for not a huge gain. Certainly not to be sneezed at though and the peak power gain doesn't tell the whole story
Yep, he does. We talked briefly about it and he reckoned it was very worthwhile. His motor is a potential 9,200rpm candidate when he gets a steel crank, though, so will be passing a LOT of air.
cheers stu,brilliant what are the standard valve sizes,im not sure as i thought there were no ways of going bigger anyway... im just reading back through the topic,v interesting
Talking of valves..I wouldn't trust the standard 16v valves at high revs. I'd be super paranoid about them falling apart wrecking my engine ! With 83.5mm bore bigger valves may not be needed if the head is ported with this in mind, you can afford to take lots of meat from the cumbustion chamber and un shroud the valve alot more with the larger bore size. Whatever Blydenstein recomends really. I'd imagine for a carb engine he's want to keep a *smaller* throat size to help speed up the air and create enough 'pull' for good resposonse from the carb.. Like i said, very engine dependant.
Going back to the lightweight bottom end thing. I spoke to a guy that does the cranks for one of the WRC teams when i was thinking about doing mine. Very nice bloke and ever so happy to share all of his knowledge with a complete stranger. He gave me a very reasonable price to: Weight match all pistons and rods. Knife-edge the crank. Balance Pulley, crank, flywheel, pressure plate. He made it quite clear to me though, that the benefit, and very obvious differences i noticed through the flywheel lightened and balancing would not be replicated again after all the crank work. Obviously if you are building a rev machine you will want a perfectly balanced bottom end, but he suggested to me that more weight loss from the fly and less from the crank was the way to head. Another thing to bear in mind... if you are making such a rev machine, and spending so much time and money balancing it all... you'll need to do it all again if you have to change a pressure plate.
good stuff tubs never thought about the re-balancing after a pressure plate change... mk1,i thought about the 20v route but,im gonna stick with 16 cheers,neil.
I'm not doing too bad so far How about this: Get the pistons and rods weight matched. Get the pulley and crank balanced perfectly. Get the pressure plate and flywheel balanced. Then, when you need to change the PP you can just get the new PP and Flywheel re-balanced. At the most you will just need to get a new flywheel, and lighten and balance that.
... aye ya doin alright m8 what you say sounds sorta right to me,but would the pressure plate and flywheel not be balanced with the crank and pulley? sorry ive had a few ...... and things seem harder to understand...
By the looks of this is going to be fecking expensive, do you plan to do it all at once ? Either way it looks a bloody good project
Riley - if 1 thing is perfectly balanced and another thing is perfectly balanced, hen you put them together, they would both be balanced as one unit...
stephcasscar cheers m8. well i lost my job a bit back,around the same time i lost my half of the house to the g/f. no job,no house,a shitty bit of in the bank and i dont give a fuck gonna buy what i have to at once but im buying/selling a few bits to fund/swap also... tubs...ahhhhhh i see think i got confused with the weight matching,cheers.
