What will go wrong, part 568240 - Dyno time..

[Babalouie]

Slightly more to it, when the pickup was aligned and ready to fire, the rotor button was not lined up with the dissy cap, hence the pickup had to be moved around so that they both lined up at the same time taking into account movement for mechanical advance. It was causing inconsistent timing and occasional missfire. Think of it as the wrong or twisted dissy cap.

Spending a day with Joe has certainly increased my knowledge of timing, carbs and engines in general.

OIC...so that "star" thing around the dizzy shaft wasn't aligned with the rotorposition in the cap. So it would fire when say the rotor was just touching the cap contact, rather than in the middle etc so your had either a too long or too short spark....

I think I'm in the same boat as you, in that I have to fix a few things which are "wrong" before I can worry too much about tuning.

[HoonBoy]

Thats it, if your timing is OK and it's easy to start, then you probably don't have that issue. It is something very easy to check at home if you know that you are looking for it! Given that yours has better manners then mine (it was a struggle to get it on the trailer..), I suspect some minor tuning would sort it out. If in doubt, give Joe a call, he will give you the answers direct rather then filtering them via me

[Babalouie]

Yeah I'll be very interested to see what happens to your car today...

[HoonBoy]

Wasn't anything interesting, pulled the carbs off and found one of the carbs not closing fully. Found the issue and ordered parts to fix which won't be in until next week. Linkages are getting custom made due to the odd way in which the factory linkages work not working 100% with the current setup or anything you can buy off the shelf. Probably won't have another decent update until late next week as he is booked out and working on my car between other jobs. He has already spent more then the estimated time for the carb tune, running in and nitrous tune sorting out the other issues.

[hgmonaro]

cool! You know what, that thing even sound a bit like my old Lancer.

At one stage I had twin 'Japanese' SU's on it and had two different guys dyno it to try to get it to run properly but couldn't. One day I was talking to the old guy at the local garage/servo (back in the days when they use to pump petrol for you) and he reckoned he could tune it. He promptly had a go and in about 10mins with nothing but a screwdriver and his ear, it was purring like a kitten... ran perfect from idle to WOT.

[SLO78U]

wouldn't have had these problems with a rotor !!!!!!

[tim510]

wouldn't have had these problems with a rotor !!!!!!

thats true!

he would have blown it up by now

[BigMuz]

Running it with dodgy timing and miles off on the fuel would have also melted seals and fouled $300 worth of plugs.

[BigMuz]

Ps !!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!

[HoonBoy]

Had some more dyno time last night. It is running heaps better with the new linkage setup but needs a stiffer return spring as one of the carbs is reluctant to close fully on the current setup. Idle jets need to be a little smaller, it shoots some nice flames when you back off from a power run, looks cool but I don't think anyone around the exhaust would appreciate it :D

Couple of more vids:

http://www.youtube.com/watch?v=c8It-Gtis6M

http://www.youtube.com/watch?v=phDxYrK4vWQ

[Ben Wilson]

Sounds nice and clean, but very quiet...

How does it drive?

[blackbart]

Needs more cannon.:D

[Ze]

Slightly more to it, when the pickup was aligned and ready to fire, the rotor button was not lined up with the dissy cap, hence the pickup had to be moved around so that they both lined up at the same time taking into account movement for mechanical advance. It was causing inconsistent timing and occasional missfire. Think of it as the wrong or twisted dissy cap.

Spending a day with Joe has certainly increased my knowledge of timing, carbs and engines in general.

The CA20E engines are worse , fucking 8 spark plugs on a 4 cylinder engine , was a bit of a head scratcher that one (since we couldn't find the layout for the plugs on dizzy in the book). After it was fixed , we ended up finding it in a different section , fuck me you think they'd put it in with replacing the head and dizzy section as well.

Mind you the dizzy was going up and down , found out the cunt reconditioner had left in some insert in the end of the cam that was half broken.

[HoonBoy]

Ben, hasn't been off the dyno yet, so I have no idea how it drives.

Spent another few hours on it tonight to track down an occaisonal miss under load. Ended up being a dodgy ignition module give a weak spark and missing every now and then. Did a temporary switch over to a generic bosch module and the spark is much better. However, sometime between checking the timing advance at the begining of the night and swapping over the module, the springs in the dissy have stopped working and we lost mechanical advance... tried to set the ignition to full advance and do a power run to see the difference and ran out of fuel... went to the petorl station and got more fuel, tried to run it again and realised that we had ignored the tachometric relay when putting in the temporary module and had to hotwire the fuel pump. Finally got a half decent run in, the mixtures are now shit as the fuel is burning much better, the curve is a lot fatter as well, but it still needs a bit of work to be right.

Now I need to get a proper module and coil to match as well as fix the alternator mounting bolt which decided to break and fix an exhaust leak that is getting worse..

[HoonBoy]

Finally got the carbs and ignition working properly. Replaced the ignition module and coil today and then regraphed the dissy and changed the rotor phasing again as it all changed with the new module. The old module was give a huge delay on the spark causing a lot of the issues. Still left with one minor niggling problem, number 2 spark plug is showing up black and has consistently blacker then all other plugs even with a change of plugs, jets etc. Going to try a different lead to see if it is not getting a good spark but it doesn't seem to be hindering the performance.

Nitrous tuning starts on Monday night, should see some nasty damage then :D