LatteCruiser wrote:
d wrote:
Finally was able to figure out which crank goes into which
I bought 2 of Honda d16 and 3 d15 engines and measured up the cranks and placed them over suzuki g16a/b and daihatsu hd-e and hc-e engines.
Compared them to the ACL catalogues and finally believe Suzuki copied Hondas sohc bottom end design
The first suzuki g series engines came out in 1983, i know this as its plain in the suzuki.co.jp history section.
D series honda engines started in 1984
this i can only go off many info sites circulating the net.
The similarities in engine design is more likely to be due to class restrictions. If a 1lt engine needs to be less than 1000cc to be called 1lt for competitions/ goverment rules etc then it makes sense to get a bore stroke combo that is as close this as possible both the daihatsu (76x73) and the suzuki 3cyl (74x77) of the same era are 993cc, the suzuki has a smaller bore and longer stroke , maybe when thinking of a 1lt they felt the torque was important, daihatsu may felt the hp was.
The 1.6l g engine fits a 1.3l head. It was most likely initially designed to power their growing 4wd/suv market which was making bigger and heavier models. Having a high hp engine like the dohc g13 would be fruitless in a 200kg or so heavier vehicle would be a really poor design and marketing decision. So the block was modified (much cheaper than scratch building an untested motor) keeping the head designs the same means the only real way to change it is stroke, keeping the bore at 74mm would of meant a 92.4mm stroke, perharps they decided the test engine had to much torque and not enough hp went back reduced the stroke slightly increase the bore and got a more favourable better result.
I don't think suzuki went out and said 'hey lets take these ideas from honda' (interesting enough suzuki supplies it's kei engines to other japanese auto manufactures!)
A few people run 1.3l head on 1.6l blocks most say there is no noticeble diff, sure the valves a little bigger and the cam slightly longer duration but suzuki most like did the differences to produce small cumalitive gains.
I'm in the process of working out if 76mm daihatsu pistons fit in an 8v g13.
If i get 8v 3cyl daihatsu pistons with 18mm pins i might need to machine g13a or g13ba rods a mm larger or maybe the daihatsu rods will fit
otherwise if i get 4cyl 16v 1.3l daihatsu pistons with 19mm pin and use the gti rods or daihatsu ones.
What's holding me back is a drive across the city to the self serve wreckers and a set of digital calipers
I suppose suzuki and honda are competitive motorcycle manufacturers so the similarity is perhaps co-incidental. Well the funny thing is the crank measurements I found are pretty much exactly the same for the mains and crankpins. Also the girdle on the honda cranks and the mains have exactly the same bolt pattern yet suzuki uses smaller lower quality bolts.
All in all its good for us suzuki lovers to have a stroker option.
On the other hand the g16a/b needs machining of the honda d16 crank mains. However the benefits of using the g16 block is the taller 215mm block height which can allow some serious rod stroke ratio advantages if you can get say an SR20DE type 86mm stroker. Also 78-79mm bores if using high quality spun billet sleeves can give you a high revving G series.
The twin cam g13b head just to clarify has smaller inlet valves.
The sohc 16v has bigger inlet valves and a low pollution high torque but boring cam profile.
Back to the Honda d16 crank journals. Just undersized by a bees dick so it will need welding and remachining to the g16 required size. Since this has to be done and extra but promising mod will be also machining the crankpins to accept 40mm main bore sized conrods like those found on bikes and the nissan e15et turbo or NA engine. The e15et rods thanks to their small bores use less material but are very strong with no failures by any exa and pulsar turbo tuner yet recorded.
LAtte - The daihatsu rods are a nice upgrade they are beefier where it counts. Ill get some pics to compare the suzuki, honda and dai ones.
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really? were they G series..ive always been disapointed suzuki didnt do a diesel variant of th g series...a steel block (whilst heavier) would 
