Gjm85'S Ke20 Build

[GJM85]

So I swapped over to the ke70 4 speed last weekend and it's a great little gearbox.

Problem is its a 100km round trip to work each day and last week saw a considerable increase in fuel consumption for obvious reasons.

I have now enlisted a wonderful piece of old tech to help me control my heavy foot. The econometer.

 

Edited April 6, 2014 by GJM85

[Mark90]

Nice! Love the little $ sign!

[GJM85]

I swapped over to a 4k points dizzy from the 5k electric. Dialed it in to 48 degrees dwell and 8 degrees advance.

The 4k has a way better ignition curve than the electric one. So much more mid range power.

 

Usual downside, harder cold starting & breaker points. But I don't mind points as I rarely rev out past 5000rpm so welding and float issues won't be a problem.

[GJM85]

I have now changed the ignition again. It's a Streetfire multi-spark CDI, GT40, ke70 dizzy, Champion 8mm leads and Bosch SuperPlus plugs gapped to 1.0mm.

I've changed to a 5k mechanical fuel pump with a return line to try and relieve excess fuel pressure build up. I've acquired a Facet solid state electric fuel pump and a Holley regulator. I made a blanking plate so I might go ahead with that soon.

I've made some changes to weber jetting and igntion timing, along with elimination a couple of vacuum leaks in the PCV system. I bought 15m of exaust wrap, so once I a get another extractor gasket, the tubes will come out and be rewrapped and sealed.

 

Timing is now 12 degrees initial @800rpm, 32 with vacuum advance and 36 degrees all in.

 

Jetting is 55/50 idle, 145/155 main, 165/160 air.

 

The idle mixture screw is 1 & 3/4 out but the speed screw is at 0 turns in. I can only assume the throttle shafts are worn down to the point where it's drawing enough air to idle soundly without the plate being turned open at all.

All in all the car is running the best it has, ever. I really should get it on a dyno soon.

 

Edited May 18, 2014 by GJM85

[GJM85]

[altezzaclub]

Yep, they're stock ports alright! :laff:

[Taz_Rx]

If you haven't already bolted the manifolds on then hit that gasket with an oxy then into a bucket of water to quench it, makes a heil of a difference.

[GJM85]

Yeah they're big ports. Kinda wish I'd done the oversize valves back in the day. But there's always next time.

Manifolds aren't on, though I don't really have access to an oxy. What's the heat do to the copper? Will it seal up neatly if I don't blow torch it?

Edited May 23, 2014 by GJM85

[GJM85]

You reckon it'd have the same effect if I put it I a 250 degree oven?

[Taz_Rx]

The copper softens and seals better. Yeah don't know of that would be hot enough. You could try it though. Easy way to tell if it works - try bending it before hand, you'll notice it just springs back. After you've quenched it when you try and bend it you'll feel it give.

[leigh]

I heated up my copper manifold gasket with a MAP torch, seemed to work alright and made the gasket change colour aswell

[indelible]

wouldnt it soften better if you heated it up red hot and let it cool slow as possible , not quenching it? thats normally how you harden metals

 

 

 

 

edit: seems after a google search some coppers do soften with quenching

Edited May 24, 2014 by indelible

[GJM85]

I didn't end up using the copper gasket this time. I had a steel one here so I'll get the copper one annealed for next time.

Pipes are now wrapped up to the collector and coated in a can and a half of ceramic flame proof paint.

I've been on two 20 minute thunder runs to cure the wrap and paint. I forgot how bad that stuff stinks. Most likely toxic.

 

[GJM85]

I decided to have a look at how much fuel was returning to the tank after fitting a fuel pump with a return line. I don't know how long it's been since fuel flowed back through these lines.

About 100ml came back after about 5 minutes but it was speckled with silver and black shit which has obviously been flowing into my tank for the last few weeks.

So in with the $1 El' homebrando fuel filter I had laying around. It will do until I figure something else out.

 

[GJM85]

Today some structural rust repairs. Lower section of the radiator support. Purchased the panel from the New Old Car Company in Lawnton for a very fair price. Made the epic journey from Beaudesert yesterday and picked it up.

Front end off. Lots of cutting and grinding. Drilled a few holes in the new part for spot welds and it's in. Benefits of brothers who are fabricators.

Tomorrow will see a couple of chassis sections cut and plated.