ZROSSA

Thanks guys. Thats good to here. I have decided to let the guy doing the heads do the bottom end as well. I am pretty good on theory but have very little practical knowledge on v8's. The way some people were talking I thought the crank would fly apart. The piston will probably be KB hyper.... at 10.5-1 and the cam is being custom ground on a bilet to match the flow of the heads. Looking for 450 hp on a 350 sbc. This is a road engine. No n02. The guy putting the engine together is pretty clued up. Has a whole stack of trophys from all different classes of racing. Cheers Douglas

Ditto....Welcome back. Hope you spent the time off building a wicked Zed. While your here could you have a looka t this.... http://hybridz.org/phpbb2/viewtopic.php?t=38277 Do you have any links that could be of benifit. Cheers Douglas

Howdy all, Just pulled the sump of the sbc and found i have 2 bolt mains and a cast crank. Part # is 3932442 which is listed as a replacement 350 crank. Anyone know how hard I can spin this? I need it to hold at least to 6500 rpm. If not its forged crank time. Dont really have the $$$$ for that right now. I really hope this will work as everthing is balanced and it just needs rings and bearings then we are ready to go. Douglas

Thanks guys. I will put some hyper... pistons in there. Wasnt sure what the crank would do. I am going to end up spending a lot on the heads so there is no point in being to cheep on the bottom end. I didnt think 6500 rpm was that high. I am used to playing with old toyota four cylinders which can see the other side of 8000 rpm with standard bottom ends. Douglas

Did a little more searching and found a co. called Powerhouse in Ca. Prices look promising. $469 Usd for a balanced assemble. Got a few more questions. Will a cast crank do for 6500 rpm? Whats with this external/internal balance stuff. Didnt some of you guys say you had fitment problems with external balancers? Douglas

Howdy all, I pulled the Sbc out last week to have a new cam made up to suit the "ported heads" i was supposed to have. Turns out the engine is in not the best nic so i am going to rebuild it while its out. The people who are building my heads are promising 450 hp so i think i will need a fairly stout bottom for it. As usuall bang for buck is very important. I wont be spinning this past 6500 rpm. Any one have any good sugestions for a stroker kit. I would like everything, Pistons rings bearings the lot. Summit racing loks promising but its not that easy to find what i am looking for. I also have a catalouge from compitition products. They have a kit listed for $700 to $730 usd depending on piston spec. I thought this looked pretty good and I remember Grumpy sugesting people use them in the past. Anyone have any better sugestions. I have to ship to New Zealand so west coast would be better. Cheers Douglas

Spring rate for cars with semi trailing arms seem to be set up a bit different then many other types of suspension. I would sugesting having a look at datsun 510 info and maybe som earlyer Bmw info. There are so many factors to look into. You need to look at weight on the front and rear and the amount of grip avalable from the tyres you will use. more grip, more spring. Also the rear seems to be set up very stiff on these cars to minimise camber and tow changes. Douglas

I drive a turbo diesel truck every day. Not one of the huge U.S. ones but a ford courier with a 2.5 lt. It has around 86 kw and 280 nm at 2000 rpm. This truck was the best torque to weight avalable on the N.Z. market when i bought it 3 years ago. It actually gets along well as a daily driver but has similar characteristics of the big ones that i think would be unpleasent in a sports car. First the usable rpm range is very low, only 2000 rpm. There is no point in taking it past 4000 rpm and its of boost at 2000. So to keep it going you need to change gear a lot. Its inability to rev out would take away any sporting apeal. My truck even could use a 6 speed to give it a bit more top end and make open road driving more pleasant. You would also need to find a higher rear gear so you would run out of rpm at higher speed. Douglas

Iam guessing this dudes in Aussie. Parts for these are easyer to source downunder. People use them a lot in jet boats around here as well. Douglas

Wouldnt that mess up air to the rear wing? I am guesing that vortex g's make turbulent air fill in behind the rear window and then make the rear seem a lot more tapered to the air flow so you woulndt get as much lift..? Tell me more. Douglas

Brian, Go and have a wander around here http://www.theoldone.com/ These guys have made some very impressive numbers with high compression and turbos. It all seems to be in the chamber shape, squish and the relationship of the top of the piston with the combustion chamber. Douglas

Got to do it. That le mans car sounded awsume. Drag car was pretty cool as well. Always had a soft spot for a rotor but never had one. They always seem to have the rule book against them on the race track. Douglas

Moby, what about increasing the volume of the cylinder heads. Deshroud the valves a bit. You would still want the chamber to be biased towards the exhuast valve.....maybe costom pistoms would be the best. Douglas

The metel man that I learned from used to drill the top layer with a small 5 - 10 mm bit and then weld up the hole. Kind of like a spot weld. You could then grind it pretty smooth and know one would know any better. Douglas

Click on the lable "scumpump". Havent really listened tp "punk" simce the days of GBH, Explioted etc. Doesnt really change much....does it. Douglas

One of these days the fiberglass work on my Z will be finished and you will see that this is exactly what I have done. I may even duct the radiator straight to the bonnet vent so that the air doesnt get confused on the way out. The fiber glass guy has had the thing for almost a year now. Nose cone and rear spoiler are done but still need my new bumper "diffuser" to me made. Good things take time............I guess Douglas

Nice work EVIL, Tried it with the tyres on? Douglas

Great reply Ian. That really cleared up a few things for me. So how would you go about the "perfect" Street Z aero package? We still need to get into driveways without ripping everything off, BTW. Douglas

Or......You could aways use some rocker arms or push rods and put the shock anyhwre you wanted it . You would also remove the bending load in the middle of the botom arm. Then the inside of the wheel well would be you restriction. Douglas

Tim, Check out the weight of the pinto. Its a heavy engine for a four. The 22r is another boat anchor. I think these engines would compleatly mess up the balance of the car. A super charged 4age would be fun. What about a v6? Buick 3.8, Nissan 3.0 single cam, ford 4.0. ......Yes I do believe that what you NEED! 3.8 and t5 out of a camaro or TA. Douglas

Owen, If you can get air from underneath the car on top of the diffuser then its no longer a diffuser, it becomes a wing working in a very turbulant position. Im not really sure what John C. is sugesting myself. Everything I have read and studied suggests otherwise. By end plates I do mean the vertical section of the diffuser. To make these things work we really need to get the cars much lower then possable for the street. Douglas

zxr, its a datsun 510. They ran in the under 2.5lt class in t/a. Douglas

Terry, Older f1 cars had similar diffusers. I think it works becuase the area in front of the rear wheels is wider. The diffuser can run a higher angle becuase as the air goes between the rear wheels the width of the diffuser narrows so it must rise to maintain volume. It is likely that this is a better diffuser design then what we see on the race cars these days as the production car doesnt have the rule constrants that most race cars have these days. Douglas

Jared, I have never played with the l6 so take this as an idea only. If you are going to have to grind the crank why not offset grind it and get a little more stroke? This woould, off coarse, mess with the precious rod lenght/ stroke ratio........... ! You are turboing this, right? Make the block strong and run more boost that with make up for displacement any day. In a n/a situation the most hp you would gain but overbore and stroking would be around 20hp. Mabye double that for a turbo. I think the money would be better spent on a strong bottom end and head work. Douglas

I havent seen the news for a while, this must be a big one if you guys are moving and your an hour away from the coast. I sat through a large one in the early eighties when i was visiting family in orlando. Lots of wind and water everywhere. Kind of exciting when you are a kid. Not so much for those that have to clean up afterwards. Hold on tight! Douglas