4Kc In Honda S600

[ewenm]

hi all, joined up here a while back, but have left this project sitting for a couple of years.

back to it now and am wondering if anyone can help with a carby question

 

i have a 80,s vintage Corolla running gear in a honda s600, a 4kc (not sure about the c) from an ,82 ke70

 

i have the 5 speed gearbox and the diff narrowed to suit on a 4 link

 

i fitted the earlier style "extractor" exhaust manifold with two outlets, as yet the rest of the system is not done

 

and twin 1.5 inch su,s

 

my problem is a massive flat spot off idle, ive got them balanced etc (used to own a cooper S, so i have an idea )

 

ive decided that when the throttle is blipped the damper in the carbies rises to quickly and so have fitted stiffer damper springs.

 

still the problem persists, although not as bad,

 

has anyone got a simillar carby set up and if so what coding damper springs are you using / recomend

 

thanks for any coments

 

EM

[altezzaclub]

A 'blip'will be controlled by the oil viscosity. Try are few different ones and see, use motor oils & gearbox oil. I use a very thin oil on my inch & 1/4s.

 

Rate of acceleration over a couple of seconds is controlled by the spring and the oil, and certainly the spring controls the piston at higher revs.

 

Do you think it is leaning out too much off idle?? I expect you will have to change the shape of the needles & richen it a touch. Do you have an oxy sensor fitted??

 

I have a set in the garage with red painted springs, probably the same as yours. There are 3 colours available I think... MG pages somewhere.

 

Have you filmed the action with a webcam on a portable?? I found that taught me more than anything I'd read, I could see the piston moving in response to the throttle (and bumps in the road!) and I could see which needle station was working where....

 

http://www.rollaclub.com/board/topic/42407-the-girls-ke70/page__p__445727__fromsearch__1#entry445727

[ewenm]

i don't think its to lean, if anything it may be a little rich althogh i seem to be able to

 

get a good idle out of it, as for the needle profile, i bought these carbys of ebay so who knows what they were off, i serviced them , new seals and needle seats floats etc

 

and needle bases

 

they had a spring loaded valve in the butterfly that i thought at first was the problem so i fitted plain ones.

 

because it has no exhaust manifold pre heat capabilities its fairly grumpy till warmed up.

 

i think i will try thicker damper oil for a first up, i have been using auto trans fluid, maybe its to thin

 

thanks for the comments

 

EM

[altezzaclub]

let us know how you go-

 

The FMD setup is the only way to really sort them out, it will check the mixture at all parts of the needle.

 

I also have no inlet heating so it takes a little longer to smooth out, especially with mornings around zero deg! The dual choke cable was worth the money, it responds well with a bit of choke.

 

cheers

[ewenm]

making slow progress, but using synthetic motor oils (mobil 1) seems to have done the job, and allowing it to fully warm up doesnt hurt either

 

now on to sanding and filling on the body

 

ive managed to pick up some old style cheviot allow wheels silver rims with a broad square 4 gold spoke set up, fitted with avon semi slick tyres

 

(you can see where this is going hehe)

 

and tonight i get to fit them, hopefully the guards will need slightly flaring

 

toughen up the tiny little car hehe

[philbey]

Off topic but I'd love to see a rides thread on this. I thought S600s ran chain drives to the rear wheels, or were there diff models as well?

[B.L.Z.BUB]

Off topic but I'd love to see a rides thread on this. I thought S600s ran chain drives to the rear wheels, or were there diff models as well?

 

 

Yes please!

 

 

 

[ewenm]

hope this works

 

http://s1099.photobucket.com/albums/g390/bigwave2255/

[ke70dave]

holy dooly that is awesome. i love s600s

 

hope you don't mind ill post the photos up here:

 

 

i saw a very very straight and shiny red S600 on the back of a trailer the other day, and the rear number plate holder looked very japense sized, and it had fender mirrors half way down the bonnet. I suspect it was a fresh import.

[ewenm]

i would love to have an original car, however mine had been hacked up by previous owners, not to mention that trying to keep an original motor running is a mission in its self let alone trying to get it rebuilt if it blows.

 

so I'm real happy with mine.

 

its a 4kc standard motor except for the early style cast 4 into 2 exhaust and the twin su carbies, it has the corolla 5 speed and a narrowed corolla rear with cut down commodore axles

 

front breaks are holden gemini discs the rear axles redrilled to suit the 4x100.

 

ive just got the period appropriate alloy wheels with Avon semi slick tyres, ive had to gently bump the guards out to cover them hehehe

 

its a sloooooowww work in progress

Edited March 1, 2012 by ewenm

[ke70dave]

love it mate, its going to be a very zippy machine when your done.

 

is that the engine in your display pic? with the 2 carbs?

 

don't have a larger version of that by any chance?

 

for no other reason than pure curiosity to see how it looks!

 

-----

was s600 the car that had a chain driven rear end?

Edited March 1, 2012 by ke70dave

[ewenm]

ive uploaded a pic of the engine bay to photo bucket, what do i need to do to load it here ?? as you did.

 

and yes they did have a solid mounted diff and then enclosed chain driven swing arms, these were fine for the original 600cc motor

 

low torque and heaps of revving, however when you stick something bigger in them the original drive train can not cope.

 

most do as i have an use a narrowed corolla or Datsun diff, ive used the 4 link corolla set up but with the upper links angled so as not to need the panard rod

 

and the original coil over style shocks, (new koni,s) all done by engineers.

 

i didn't want anything to sophisticated , something easy to work on, and the corolla running gears fits the bil.

 

others have used Mazda rotary s, and 4 cylinders and there is even one in Brisbane with a hyabusa motor cycle engine, have a look on youtube.

Edited March 1, 2012 by ewenm

[ke70dave]

ah very cool mate.

 

yeah you just copy the link in the photo that has the "IMG code" bit from photobucket.

 

looks like this, but with square brakcets on the end to make it work.

 

IMG]http://i1099.photobucket.com/albums/g390/bigwave2255/DSC06337.jpg[/img

 

 

geez that motor fits in there nicely. love it. especailly how the carbys sit. whats happening with the firewall? is that how it is?

[ewenm]

all the wiring is still exposed till I'm sure its all done, yeah thats pretty much how the fire wall looks, usually there would be two master cylinders there you can see where the clutch cable attached to the pedal arm

 

and the booster is offset towards the motor as there is no room straight off the pedal, so in the cabin under the dash there is a link to take the brake action over towards the centre (does that make sense)

 

and yeah it should go hard, same top speed as a KE70 but heaps quicker getting there hehehe

 

ive wanted one of these since i first saw one as a kid, its taken a long time and I'm not rushing to finish it.

 

ive had a ball finding all the missing parts and getting it all together, and now its just a case of finishing it all

 

my focus now is to get the body work done and painted, so that when done it will inspire me to get back to the millions of little pain in the ass jobs

 

thank for sort the pic for me, much appreciated

[ke70dave]

no worries mate, keep the updates coming when you can, we like photos here!

 

the s600s really are a beautiful little car.

 

whats that potentiometer down near the bottom left of photo, near the radiator? radiator fan controller?