Starting a new engine!

Moderators: Simjen, KiwiBirkin

Forum rules
Forum Rules.

1: Post anything to do with general engine & gearbox stuff in the main forum.

2: Only post in the engine specific tech forums with technical information on that engine as it is there for people to find technical info that has been posted on these forums and is usefull to their engine build in their clubman this should help people locate all the good tech help you have all supplied in the past.
User avatar
Not-a-Number
Paid Member
Posts: 845
Joined: Tue Sep 13, 2011 12:54 pm

Re: Starting a new engine!

Post by Not-a-Number » Thu May 24, 2012 7:15 am

So my carbs are;

37choke, 110mains, 155 air corrector, f16 emulsion tubes, 45f9 idle, pump jet 35, acc intake 60, 4 aux venturi.

User avatar
Rookie
Paid Member
Posts: 1648
Joined: Wed Apr 22, 2009 4:01 pm
Location: Taupo

Re: Starting a new engine!

Post by Rookie » Thu May 24, 2012 8:13 am

Was it running on those before :shock:
Locost 7: Powered by 1660cc of British FURY! coming to a town near you soon.

Remember: If a mechanic can do it, so can YOU!

Image

User avatar
Not-a-Number
Paid Member
Posts: 845
Joined: Tue Sep 13, 2011 12:54 pm

Re: Starting a new engine!

Post by Not-a-Number » Thu May 24, 2012 8:51 am

Yes since new (9000k) but if you look back at the pictures of the pistons when i got them out two were coated in some super hard crap which was wrecking the rings. So running poorly?

Iv read you want about a 50 difference between main and corrector but is usually lower. But my main seems quite low. Most are 125 to 140 but i have seen reference to xflow 1700s being 110 but they are reving to over 7000 with 244 cam.

User avatar
Rookie
Paid Member
Posts: 1648
Joined: Wed Apr 22, 2009 4:01 pm
Location: Taupo

Re: Starting a new engine!

Post by Rookie » Thu May 24, 2012 10:01 am

Hate to be the bearer of bad news but you are up for about $1000 worth of parts to get those right.
Just spoke to the resident Kent expert and this is how he said it should be set up (all ball park figures but will be much closer than what you have)

165 Main Jet
170 Air Corrector
f16 Emulsion Tube

55 Idle Jet
f9 Idle Emulsion Tube

45 Pump Jet
34 or 35 Choke
170 neelde and seat
Locost 7: Powered by 1660cc of British FURY! coming to a town near you soon.

Remember: If a mechanic can do it, so can YOU!

Image

User avatar
Not-a-Number
Paid Member
Posts: 845
Joined: Tue Sep 13, 2011 12:54 pm

Re: Starting a new engine!

Post by Not-a-Number » Thu May 24, 2012 11:29 am

Gutted. Price all that up on ebay though and its about 350 nz new. Ill check their actual sizes though because they may have been drilled. Is a 110 main lean or rich? 155 corrector is rich at high throttle?

User avatar
Rookie
Paid Member
Posts: 1648
Joined: Wed Apr 22, 2009 4:01 pm
Location: Taupo

Re: Starting a new engine!

Post by Rookie » Thu May 24, 2012 11:39 am

The numbers are 100ths of a millimetre, so a 110 is a 1.1mm hole. I think my stock kent has a 140 main so 110 should be well lean. Yea, its vicer versa for the air corrector, smaller means richer, but it applied maily to the top end. If you can get all that for $350 you are doing well, I know that just the chokes are about $120 each.
Locost 7: Powered by 1660cc of British FURY! coming to a town near you soon.

Remember: If a mechanic can do it, so can YOU!

Image

User avatar
Not-a-Number
Paid Member
Posts: 845
Joined: Tue Sep 13, 2011 12:54 pm

Re: Starting a new engine!

Post by Not-a-Number » Thu May 24, 2012 7:04 pm

I actually made a mistake because I'm a noob. The chokes are 28. I've been told I can machine them out fine. So I'd be up for some jets Which are worth between 5 and 15 bux on weberPerformance.com.au

User avatar
7ish
Paid Member
Posts: 1776
Joined: Sun Apr 19, 2009 3:43 pm
Location: Northwood,Christchurch
Contact:

Re: Starting a new engine!

Post by 7ish » Thu May 24, 2012 7:09 pm

Unless you can machine a great Venturi, you can't make a 28 choke into a 34 one. The flow is critical in this area.....it makes the vacuum to pull the fuel through the main jets. If the vacuum is wrong, the main jet sizes will be all wrong.
7ish

User avatar
7ish
Paid Member
Posts: 1776
Joined: Sun Apr 19, 2009 3:43 pm
Location: Northwood,Christchurch
Contact:

Re: Starting a new engine!

Post by 7ish » Sat May 26, 2012 9:18 am

http://www.guy-croft.com/viewtopic.php?f=13&t=1238

Chech these pictures... It can be done if you know exactly what you are doing. Personally, I wouldn't take the chance of stuffing up a precision made carb .... Put the 28's on TM and buy the right ones.
7ish

User avatar
Not-a-Number
Paid Member
Posts: 845
Joined: Tue Sep 13, 2011 12:54 pm

Re: Starting a new engine!

Post by Not-a-Number » Sun May 27, 2012 12:00 pm

Just read the weber carb book by John Passini. Ford lotus webers are meant to be 40dcoe31, I have 40dcoe28 with 28mm choke and all the jet settings for a ford 1300. Whats the difference between a 31 and a 28? Is that its standard choke size?

In their setup list it does refer to some 1600 xflows with 27-28mm chokes and reference to small main jet sizes with that set up. From what iv read, yes they are wrong for a 1600xflow but they will run ok just be very down on power.

Post Reply