mikuni Posted January 6, 2012 Share Posted January 6, 2012 From what I've read, proper engine builders stay away from decking blocks or skimming heads by the amount required to bump the CR up by a point or so. I understand it can create a sub par combustion chamber shape and lead to some issues with swirl/mix etc. In an engine like the BEAMS I'd say Toyota (Yamaha) would have engineered it pretty well up top. Are you doing pistons? What about some crazy sorts of high comp slipper pistons or something to get it doing nice things. Technology has come quite a long way recently with injector technology, not to mention ring and cylinder coatings you can now do quite cheaply to reduce losses and make things run more effeciently = more power. Also regarding modern engines, Mazdas new range of petrol and diesel turbo engines are all 14:1 CR Unheard of! Very off topic though. Quote Link to comment Share on other sites More sharing options...
DodgySam Posted January 6, 2012 Share Posted January 6, 2012 12:1 comression is ALWAYS a good thing...but ue not a real man till you get it up round Diesel spec and run 27:1 compression! Most modern diesels these days are running as low as 14:1 CR. also with skimming 0.5mm off the block would you run into issues with the crown of the piston hitting the overlap of the head gasket if there is any? What about the valves, are the pockets in the crown deep enough for an extra 0.5mm? I would perhaps look at fitting a thinner head gasket if they are available or if you're not using one already. Thats cos most modern diesels are turbo and require lower compression for reliability. Quote Link to comment Share on other sites More sharing options...
Truenotch Posted January 6, 2012 Author Share Posted January 6, 2012 Not going to break the bank on pistons. Everything has already been balanced and we're good to go apart from deciding on whether to deck the block. The piston edge sits 1mm below the mating surface and Toda do a .3mm head gasket to bring the comp up to 12:1 (standard is .8mm) so I figure skimming .5mm should be safe. We won't know without trying it though. I considered buying a Toda from Simon/Surfab in CCH but nothingsfree snapped it up first . Might just slap it back together and be happy with 11.5:1 instead. Quote Link to comment Share on other sites More sharing options...
nick_m Posted January 6, 2012 Share Posted January 6, 2012 that would depend your piston/rod combo and intended revs. I would probably be inclined to leave it as the gain would pretty minimal in the grand scheme of things and you would be absolutely slutted if you destroyed an engine, they can sometimes go in a big way when it happens too! Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted January 7, 2012 Share Posted January 7, 2012 Yea I reken leave it as it, unless you upgrade to pinto pistons it would be too risky. Just promise me you don't jew out on the tuning. Quote Link to comment Share on other sites More sharing options...
Truenotch Posted January 9, 2012 Author Share Posted January 9, 2012 Weld over the chassis code? OK . Quote Link to comment Share on other sites More sharing options...
Roman Posted January 9, 2012 Share Posted January 9, 2012 I'd rather skim the block than run a thinner head gasket. Wouldnt be surprised if the toda one is just like factory but fewer layers of steel. Would rather have better odds of sealing well, and ease of replacing with factory gasket if need be. Quote Link to comment Share on other sites More sharing options...
Brock-Lee Posted January 9, 2012 Share Posted January 9, 2012 ^Im with that guy. Just assmble without a headgasket to see if shit is going to mash together/check clearance and then skim away. Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted January 9, 2012 Share Posted January 9, 2012 damn i love this car. Wish i had something even slightly intelligent to say but nope, totally dont. Quote Link to comment Share on other sites More sharing options...
EURON8 Posted January 15, 2012 Share Posted January 15, 2012 Started on Tub #1 tonight: Single axle trailer gaurds? Quote Link to comment Share on other sites More sharing options...
xsspeed Posted January 15, 2012 Share Posted January 15, 2012 ^ yep, and lush as eh, looking good Markku Quote Link to comment Share on other sites More sharing options...
Truenotch Posted January 15, 2012 Author Share Posted January 15, 2012 You've got it Chris. Only used one to do both sides and sold the other to Mikuni for supertouring. Just because SS2000 wouldn't let me do this (which we did to a friends shell the other day... Will be a 1UZ race car, watch this space). Quote Link to comment Share on other sites More sharing options...
Brock-Lee Posted January 15, 2012 Share Posted January 15, 2012 This thuing makes me swoon so hard. Keep your shit dope son. Quote Link to comment Share on other sites More sharing options...
EURON8 Posted January 15, 2012 Share Posted January 15, 2012 Oh choice. Gonna copy Also 1uz car is awesome. Looking forward to practicing this stz on my cres for practice. Quote Link to comment Share on other sites More sharing options...
LingLing Posted January 31, 2012 Share Posted January 31, 2012 hey bro, do you know, have you been to Hampton downs before with this car? Do you know a flying lap time at Hampton downs? If so, what was your bhp and tires at the race track? Quote Link to comment Share on other sites More sharing options...
Truenotch Posted February 1, 2012 Author Share Posted February 1, 2012 Nope. I've never had the cash or the motivation to take my car that far north, but I'd take a wild guess at around 1:17. Horsepower is only a small piece of the puzzle man - my car has never been far above 115kw at the wheels but it manages to get the power to the ground and flick around corners. Have you done any laps around Hampton before? It takes a while to really get the hang of driving a car on its limit. Quote Link to comment Share on other sites More sharing options...
LingLing Posted February 1, 2012 Share Posted February 1, 2012 yeh, I should, according to last owners log book, His was aiming for 1:17 at Pokekohe. he only managed 1:23 tho. I am guessing my car only have 90-100kw at the crank, so proabably 80-90kw at the wheels, which is really enough. so Yeh, I will see what the car can do once I got chance to go to Hampton downs or pokekohe. I have got semi slick tyres, But I really want to put road tyres on them see how the car handles once the limit is reached. Quote Link to comment Share on other sites More sharing options...
Truenotch Posted February 2, 2012 Author Share Posted February 2, 2012 To give you an idea Andy, Steve Wilcock is doing 1:17's in his 150kw N2 86 on full slicks. If I were you, the aim would be sub 1:25ish. Quote Link to comment Share on other sites More sharing options...
My name is Russell Posted February 2, 2012 Share Posted February 2, 2012 you got a ss2000 race lined up? Quote Link to comment Share on other sites More sharing options...
Simon Posted February 2, 2012 Share Posted February 2, 2012 Sorry for my dig at you in here last night Andy, me venting on random people is out of line. You didn't deserve it. Quote Link to comment Share on other sites More sharing options...
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