I am in the process of planning my b17 turbo build, so far I have only found the Crower make the rods, and they are really, really proud of them. So I began to look at other combos to get a better rod/stroke ratio. In my b17 block, if I use a b16 crank (77.4mm stroke) , with rods from b18 (137mm) I will have an over squared r/s of 1.77. At 84mm bore it will be 1.7L. The difference in length between stock and this combo is 0.01mm. And according to the deck height calculation I will have piston clearance. I wold use a stock crank and after-market forged rods, with after market dished pistons.
Pros,- better r/s ratio, parts are easier and cheaper to find (Rods)
It looks like you are planning a very technical build.
Why the emphasis on r/s ratios if you are going the boosted route, not that I’m trying to deter you, I’m just curious?
I’m sure they have after market rods for the B17A, it was covered in another thread. I’m not sure if they are made by Eagle though.
A 84mm All Motor B17A would be sick, revving out to 10,000 rpms. (if you into that sorta stuff)
A good r/s ration will mean less side loading on my piston walls which means less wear and tear meaning longer life. With lower crank to rod angles I can rev higher, with more power much safer, with a built head 9,000-10,000 rpm can be reached. I am wanting to build a reliable stong bottom end. I think that I can afford to loss the displacement because I am planing to boost, although the thought of ctr pistons has entered my mind. I called eagle today and the rep said they do not make rods for the B17. I found a set on ebay, now I need to score a b16 crank. Once I have the crank I’m gonna mock it up with it up with my p61 pistons. If it won’t fit then I am going to be looking for a b18a block and mill it down to the deck height I need.
Around 320. Going to use a lc-1 wideband with xd-16 gauge. I had my heart set on using the S300 for tuning but I am now leaning toward the neptune rtp. From what I see it has all the features plus some, and it is cheaper.
If you use the B17A block sleeved to 84mm and crank… with B16A Aftermarket rods and pistons (10.5:1 is what I would use), it should make for a really sweet bottom end. However…unless you can stop the block from twisting above 9000+ rpms, the crank bearings will take a beating and so will reliability. A CTR or ITR block with their girdles would help.
320whp with a B16A or B17A sleeved 84mm block on boost, is very doable and would maintain a decent amount of reliability. I’m not sure about revving to 10k but is very interested in a build that will live up that high in the RPM band.
Been really busy with work and finals. Chem. is for the birds. I put some data that together and then made charts to compare different engine combs. Can anyone tell me how to upload excel carts to g2ic? It get an error when try to to upload them. Thanks