It is currently Mon Nov 20, 2017 2:07 pm

All times are UTC + 10 hours




Post new topic Reply to topic  [ 153 posts ]  Go to page Previous  1 ... 4, 5, 6, 7, 8
Author Message
 Post subject: Re: Our little cultus racer
PostPosted: Mon Oct 16, 2017 5:36 am 
Offline
User avatar

Joined: Tue Feb 23, 2016 5:38 am
Posts: 131
Location: Christchurch
I think it would be worth your while having a talk to Autobend ( http://www.autobend.co.nz/ ). They have a cad design for the flange so you don't have that cost. They have various designs of collector cones off the shelf. They can mandrel bend to the required shape so there's no cutting and welding required. They might even be able to calculate the required pipe lengths/bend angles but I've never asked that question.

Obviously the effective pipe lengths need to match given the bend angles and length of pipe and this is pretty hard to get right by cutting and welding lengths from mandrel U bends.


Top
 Profile  
 
 Post subject: Re: Our little cultus racer
PostPosted: Wed Oct 18, 2017 6:52 pm 
Offline

Joined: Sat Apr 30, 2005 9:27 pm
Posts: 825
Location: Brisbane
If you go to big on the primaries you will lose power down low

It is quite a science to get it all to work


Top
 Profile  
 
 Post subject: Re: Our little cultus racer
PostPosted: Thu Oct 19, 2017 6:09 am 
Offline
User avatar

Joined: Tue Feb 23, 2016 5:38 am
Posts: 131
Location: Christchurch
As Steve said extractor design is a science in itself.

I guess the really serious racers will build an extractor for each engine configuration.

Basically the primary diameter is a function of bore/stroke, valve size, CR and cam. The length determines the rpm range where maximum scavenging will take place. Short for higher rpm and longer for mid range or lower rpm but obviously this needs to fit with the cams being used. I'm pretty sure Graham Bell's book on 4 stroke tuning contains all the formulas if you want to calculate the diameter and length properly ( it's probably been copied to the internet by now ).

I guess the keys points to consider are that any commercially built extractor is unlikely to provide full benefit as they really need to be built to your engine configuration but on the flip side any diy built extractor that isn't equal length is unlikely to yield a better result.


Top
 Profile  
 
 Post subject: Re: Our little cultus racer
PostPosted: Sat Oct 21, 2017 6:14 pm 
Offline

Joined: Mon Dec 19, 2016 10:40 am
Posts: 169
Location: NZ
Blake has sent me a tubular cultus manifold. Thanks Blake! =D> . Yes they are skinny pipes but it's the basis for a system...means I don't have to muck around making a flange. He looked for a cast manifold but it was the wrong one. Yes I could use mine but it's 160 plus gst to resurrect. I'll use 1.5" pipe for the primaries...4,2 1. If the standard cast is ok I'll just make the header like that....with equal pipe lengths in the same configuration....extend the secondaries to the sway bar in 1.75" and merge into 2.25". That's the plan.......I'll overthink it like everything else and never get the car back on the track so I'll stick to basic and use it as a starting point. I'll see how it goes on the dyno and the track. If it's not tuned well enough for what we want in terms of performance then I have exhaust, cam dialing and stand alone computer options to explore. :)


Top
 Profile  
 
 Post subject: Re: Our little cultus racer
PostPosted: Fri Nov 03, 2017 3:14 am 
Offline

Joined: Mon Dec 19, 2016 10:40 am
Posts: 169
Location: NZ
Not much happening lately as one of my kids is being a stupid immature idiot. Been fixing other cars trying to sort out children and other life crap.

I leave Los Angeles tonight and once home I have got 18 days off on Leave. I'm going for the big push. Everything is coming together....
It's been a right bugger finding a gasket for the oil pump. But bewitched gti has me covered on that. Thanks Steve!

I have bought a setrab oil cooler and a mocal thermostat sandwich plate. A canton 1 quart accumulator with 8 AN lines. It's all in the effort to run the oil cooler with a low oil pressure surge remedy. I know all about dry sump systems, windage trays etc etc but looking for a bolt on quick fix. Short races it will make no difference I imagine and we don't appear to have low pressure surges around Manfield but then we only had a light so wouldn't really know. I read Dattman suffered low pressure on long left handers somewhere? Anyway....talking with my mate Phil he put the idea of the canton accusump in my head and now I have one. I got the stuff from the UK from JCC rally and he liked the setrab coolers....boy it sure looks built beautifully. The shipping took less than 6 days! Arrived well packaged and shipping was only $40 nz. I got the cooler, mocal OTS1 sandwich plate with 1/2 bsp to 8 AN fittings, the setrab 1/2 bsp to 8AN fittings with dowty seals. The whole setup isn't cheap but then neither is doing up the engine.

I'll post some more pics in a few days before it goes back into our now dusty car.


Top
 Profile  
 
 Post subject: Re: Our little cultus racer
PostPosted: Fri Nov 03, 2017 5:23 am 
Offline

Joined: Mon Aug 25, 2003 12:00 am
Posts: 1526
Location: Londoninium
JCC rally are pretty good, bought from them a few times when the local guys wouldn't or couldn't supply, and it was always cheaper including postage to OZ.

GTP


Top
 Profile  
 
 Post subject: Re: Our little cultus racer
PostPosted: Fri Nov 10, 2017 4:59 pm 
Offline

Joined: Mon Dec 19, 2016 10:40 am
Posts: 169
Location: NZ
yup JCC rally are very good. The setrab cooler adapters came only one to a packet but the picture showed two and nothing said only one included. I queried Dave at JCC race and rally...he apologised for the confusion and as an apology for the confusion he has sent me one FOC from the UK...should be here any day. I was happy to pay for the other one but he admitted the picture leads you to believe two are included. so the short of it is...JCC race and rally are very much worth dealing with for cooling stuff.

Another huge thanks to Suzistore for providing me with the oil pump gasket (in fact two!) that I needed as he other option was either make one or wait two weeks from ex japan. Steve got them sent here in a few days from Aussie. My pic shows a Suzistore sticker under the door handles...thanks bewitched gti...Steve!

The motor is mostly together....yes its not painted...no one will see that...and I'm running out of time so once the box is done its time to refit it soon. The rusty oil pressure sender unit will be removed...its just covering the hole...i have a remote mount on a braided line for the senders.


Attachments:
IMG_4423.JPG
IMG_4423.JPG [ 372.38 KiB | Viewed 5 times ]
IMG_4422.JPG
IMG_4422.JPG [ 432.5 KiB | Viewed 6 times ]
IMG_4421.JPG
IMG_4421.JPG [ 396.09 KiB | Viewed 6 times ]
IMG_4420.JPG
IMG_4420.JPG [ 402.69 KiB | Viewed 5 times ]
Top
 Profile  
 
 Post subject: Re: Our little cultus racer
PostPosted: Mon Nov 13, 2017 8:32 am 
Offline

Joined: Mon Dec 19, 2016 10:40 am
Posts: 169
Location: NZ
Ah poos and wees. Fitted a non CAS pump as I couldn't be bothered trying to find all the bits needed for the crank angle sensor in case I went to an aftermarket ECU. Thought I'd just mod the dizzy. Ratting through the parts box this morning looking for a thermoswitch I found a crank angle sensor and the sump to match. DOH :oops: I guess if needed one day I'll have to do it in position


Top
 Profile  
 
 Post subject: Re: Our little cultus racer
PostPosted: Mon Nov 13, 2017 9:52 am 
Offline
User avatar

Joined: Thu Jun 09, 2005 11:16 pm
Posts: 3227
Location: Perth WA
When the time comes, I’ll rebuild a factory baleno oil pump and send it to you then

_________________
ワイドガード 体 GTi


Top
 Profile  
 
 Post subject: Re: Our little cultus racer
PostPosted: Mon Nov 13, 2017 5:46 pm 
Offline

Joined: Mon Dec 19, 2016 10:40 am
Posts: 169
Location: NZ
might have to do that Steve if the stock ECU with the group A chip doesn't work well. Got a new belt for the under drive pulley today...had to guess how much tension on the belt as no spring....


Top
 Profile  
 
 Post subject: Re: Our little cultus racer
PostPosted: Tue Nov 14, 2017 12:00 am 
Offline
User avatar

Joined: Thu Jun 09, 2005 11:16 pm
Posts: 3227
Location: Perth WA
:lol: the springs are a factory liability, chuck those in the bin.
If you can do a 90 degree twist, but no further (fingers on the belt on the long side near exhaust) then the tension is right.
If group A chip isn’t suitable, source a Sandros Chip from Teamswift, it was setup for the 3tech 210/340 cams, so yours being wilder still should be more suitable
The 952 (Group A) grind is more conservative than 210/340..


Top
 Profile  
 
 Post subject: Re: Our little cultus racer
PostPosted: Tue Nov 14, 2017 8:38 am 
Offline

Joined: Mon Dec 19, 2016 10:40 am
Posts: 169
Location: NZ
yes the spring was the thing that caused the belt to jump a tooth in the first place...so Ill never keep them in there. I tensioned it using the mark1 handometer....thanks for the info....as luck has it Ive just twisted the belt 90 degrees on the long part of the belt on the exhaust side and thats it...almost bang on 90 degrees with a fair amount of finger pressure so happy... =D>


Thanks for the info Steve.

I hope I have not gone too wild with the cams...everyone is telling me I should have stuck with cultus ones...well...guess Ill find out soon enough.


Top
 Profile  
 
 Post subject: Re: Our little cultus racer
PostPosted: Wed Nov 15, 2017 5:51 pm 
Offline

Joined: Mon Dec 19, 2016 10:40 am
Posts: 169
Location: NZ
fitting a cultus manifold is not as simple as bolting it on....the braces are all different except one so now I'm making a new brace for the middle....plus blanking off the multitude of vacuum tubes and working out which ones I need....any one with any info on that?
cheers. G


Attachments:
IMG_4427.jpg
IMG_4427.jpg [ 458.53 KiB | Viewed 2 times ]
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 153 posts ]  Go to page Previous  1 ... 4, 5, 6, 7, 8

All times are UTC + 10 hours


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © phpBB Group