Yet another RWD thread
Posted by Gravity Fed
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Alex Staidle Godlike Moderator Location: Δx = ħ/2Δp Join Date: 08/21/2009 Age: Settling Down Posts: 1,719 Rally Car: Various Heaps |
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Alex Staidle Godlike Moderator Location: Δx = ħ/2Δp Join Date: 08/21/2009 Age: Settling Down Posts: 1,719 Rally Car: Various Heaps |
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Gravity Fed Wrote:
------------------------------------------------------- > any changes in the overall suspension design? > > ------------- > "The beatings will continue until morale improves" Alex 20 years ago when late 70s/early 80s Japonaise stuff was common as shit on the lawn, when it hit the wreckers, they'd pull the copper rads and often set the over in the crush now pile. The motors NEVER really died so no market for them---not with the Japanese Engine Import thing supplying clean 3 y.o. motors and boxes. Then, inexplicably the inscrutable Oriental bastids stopped making RWD cars and nobody knows why.....it just happened............. That said there are a liot of common things with them, nearly all: ~crappy recirculating ball steering with about 15-18 turns lock to lock new, 20-22 turns now, even if the did rack and pinion as Toiletta did a couple of years prior to the AE86, its slower than sheeeeut. ~tiny brakes from using 13" forever ~ gearbox ratios that make Xratty's seem ultra close. ~ small, flimsy suspension since it was a 78bhp grocery getter A hugely annoying tendency to copy eaxchother in each car generation and the critical last years virtually everything the Nipponaise sold HERE had these heads like Toiletta 22R, Ratsoon NAPS-Z, Misterbitchy G32, Maz-dog's little shitboxes a whole slew with SOHC and LONG fawkin rockers and valve angles nearly 60*or more included angle. Here: 22R 
Naps-Z 
Mitsu Colt 
Typical chamber; 
All these long rocker designs were all horribly intolerant of changes in cam base circle. Tiny change and the rockers were pointing wrong so cams became a huge problem---reduced circle re-grinds guaranteed bad guide wear, And those huge open chambers made making any half-un-lame compression difficult, and we all know that without lots of static compression, we can't go to cams with later intake closing cause later intake valve closing means the time left to make compression is less. (As an example, I did a Normal aspirated Cosworth YB 16v with intake valve closing around 80 degrees after BDC....think about it: normal method for finger compression is piston down at BDC, measure cylinder v + gasket v + chamber v ---for our example no dish or dome of valve reliefs---then run piston to the top and measure gasket v + chamber v + and deck v if the piston isn't flush. Then devide the one by the other and presto!!! Youse gots a whopping 11.5 compression motor. But remember it only goes 180 degrees from BDC to TDC and until that damn intake valve closes you are making zero compression. The 80 degree figure means the piston is damn near halfway up, so the corrected compression is a girly-manly maybe 9.8-10:1 max So there was problems making good snappy serious power out of the last of the Japonaise rwd powerplants. And of course, as usual we didn't get the good stuff easily like Nissan's copy of Ford Cosworth BDG 2,0 called the FJ20 Long and short of it, even if there were loads left around in the yards there's better choices to get more wallet friendly motors with LOADS of torque and that's what we want if we want to have fun and not be forced to buy true close ratio gearsets---a whole new can of worms with all older Jap cars. John Vanlandingham Sleezattle, WA, USA Vive le Prole-le-ralliat www.rallyrace.net/jvab CALL +1 206 431-9696 Remember! Pacific Standard Time is 3 hours behind Eastern Standard Time. Edited 1 time(s). Last edit at 09/22/2009 06:25PM by john vanlandingham. |
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