64 replies to this topic

[Dominic Dent]

Hi I’m new to the forum.

I’m running a 1973 fuel injection 7 port head from specialist components with Jenvey throttle bodies. The engine is 1330 with omega pistons and H beam con rods. The crank and flywheel has been balance and it has a 266SS cam from Keith Calver.

The car has been to the dyno and has been mapped, making 86bhp at 5100rpm.

The first few hundred miles everything has been ok but now I’ve been through 2 sets of plugs. It starts and runs ok for a few miles and then once it’s at temp drops down to 3 cylinders, it’s not the same cylinder each time so I’m struggling to find a solution. 

 

Has anyone got this setup and had a similar problem, I’m getting very frustrated, I thought specialist components where a good company but I’m getting to the point of pulling all of it off and going back to  a set of carbs.

 

 

 

[sonikk4]

What size are the injectors??

220cc are more than enough and SC have a habit of supplying far to big a size injector sets.

I have the SC Billet Aluminium 7 Port and asked them for 220 injectors. I passed this info onto Graham who a similar set up to you in his pup. I’m waiting for my engine to hit the dyno to see what the final results are.

[sonikk4]

IronmanG can give you some more info as we both had our engines built by Ian ‘Oz’ Osborne and Graham had some issues getting his engine up and running properly. (Oz really helped with the issues and I’m hoping off the back of that mine will be a bit easier. ) Nothing to do with Oz as he is a mini engine wizard. A lot of it’s down to the ECU supplied by SC and of course the bloody huge injectors.

[Dominic Dent]

Injectors are 215cc. Not sure what the injectors have to do with losing a cylinder 

[sonikk4]

Injectors are 215cc. Not sure what the injectors have to do with losing a cylinder

Flooding, overfueling, running so rich they foul the plugs. I take it you are running a Delta ECU as supplied by SC??
If the map is wrong that will cause all sorts of issues.

Hopefully Graham will join in and explain what happened with his engine.

[IronmanG]

Hi I’m new to the forum.
I’m running a 1973 fuel injection 7 port head from specialist components with Jenvey throttle bodies. The engine is 1330 with omega pistons and H beam con rods. The crank and flywheel has been balance and it has a 266SS cam from Keith Calver.
The car has been to the dyno and has been mapped, making 86bhp at 5100rpm.
The first few hundred miles everything has been ok but now I’ve been through 2 sets of plugs. It starts and runs ok for a few miles and then once it’s at temp drops down to 3 cylinders, it’s not the same cylinder each time so I’m struggling to find a solution.

Has anyone got this setup and had a similar problem, I’m getting very frustrated, I thought specialist components where a good company but I’m getting to the point of pulling all of it off and going back to a set of carbs.

Am in florida so out of sync.
In my view specialist components suck. Thats my experience.

Which dyno did you use. Are you using the delta 400 and was it a delta specialist you used?

Edited by IronmanG, 15 August 2023 - 09:42 PM.

[Steve220]

What compression ratio is it? What temperature plugs are you using? What coil pack is it? What is your igntion dwell setting on SXtune? Have you got a wideband lambda connected to the ECU?

[Java_Green]

Hi I’m new to the forum.

I’m running a 1973 fuel injection 7 port head from specialist components with Jenvey throttle bodies. The engine is 1330 with omega pistons and H beam con rods. The crank and flywheel has been balance and it has a 266SS cam from Keith Calver.

The car has been to the dyno and has been mapped, making 86bhp at 5100rpm.

The first few hundred miles everything has been ok but now I’ve been through 2 sets of plugs. It starts and runs ok for a few miles and then once it’s at temp drops down to 3 cylinders, it’s not the same cylinder each time so I’m struggling to find a solution. 

 

Has anyone got this setup and had a similar problem, I’m getting very frustrated, I thought specialist components where a good company but I’m getting to the point of pulling all of it off and going back to  a set of carbs.

I would have expected more power from a set up like that. Should not you expect more from a port injected X-flow engine?

[IronmanG]

Hi I’m new to the forum.
I’m running a 1973 fuel injection 7 port head from specialist components with Jenvey throttle bodies. The engine is 1330 with omega pistons and H beam con rods. The crank and flywheel has been balance and it has a 266SS cam from Keith Calver.
The car has been to the dyno and has been mapped, making 86bhp at 5100rpm.
The first few hundred miles everything has been ok but now I’ve been through 2 sets of plugs. It starts and runs ok for a few miles and then once it’s at temp drops down to 3 cylinders, it’s not the same cylinder each time so I’m struggling to find a solution.

Has anyone got this setup and had a similar problem, I’m getting very frustrated, I thought specialist components where a good company but I’m getting to the point of pulling all of it off and going back to a set of carbs.

I would have expected more power from a set up like that. Should not you expect more from a port injected X-flow engine?

Wrong camshaft for injected 7 port but I reckon sort the problem first then worry about that? Unless that's showing a build issue?

What we've found is the port speed for the cast 7 ports is too slow as they are too large. I spoke to ACDodd last month and he said they are designed to go on a >1380 revving to 8k. So the camshaft needs to be suited to that. Below 3000rpm regardless of what camshaft is used,a 5 port will be better.
Above 5000 they pull away from a 5 port.
That's why SC recommend Keith Calvers RE13pp. The bottom end is controlled by the injection to make it manageable then at 3000 it takes off at the same point the head starts to work.
The billet head could be different. Still waiting for Neal to get his dynoed🥱🤣

Edited by IronmanG, 16 August 2023 - 12:18 PM.

[Dominic Dent]

Running the delta ECU.

plugs are NGK C8E

I don’t know the ignition dwell setting in SXtune

No wideband lambda connected to the ECU as SC said didn’t need one once dyno’d

Noble motorsportcars in Chesterfield did the tuning

camshaft was provided by Keith calver as specifically for the 7 port

[sonscar]

You really need to see the live data from the ECU when it is running to help pinpoint or rule out things.A wideband is almost a given for injected setups,granted when correctly mapped and running well it is not needed,but when problems occurr it is very useful.Although I have no knowledge of this particular kit I cannot see it being rubbish.Granted the support may be leaving.Good job it is not a Megasquirt fitted yourself as my two EFI cars are.Steve..

[IronmanG]

Running the delta ECU.
plugs are NGK C8E
I don’t know the ignition dwell setting in SXtune
No wideband lambda connected to the ECU as SC said didn’t need one once dyno’d
Noble motorsportcars in Chesterfield did the tuning
camshaft was provided by Keith calver as specifically for the 7 port

Camt remember offhand but I'm pretty certain I'm running 6s.
I was supplied 8s by SC and they are wrong unless you are on a race track.
Your max power should be up by 7000 not 5000rpm.
I've had a lot of contact with Keith and graham russell and he says re13ot or preferably re13pp.
Quite a bit more duration than yours I think
And definitely get the wideband as mentioned

Also try to use 1 of the delta specialists. It seems to be finicky for guys that don't use it.
https://www.scs-delt...k/dynolocations

Look on here for your nearest and use them

Edited by IronmanG, 16 August 2023 - 07:48 PM.

[IronmanG]

Yep 6s from the green spark plug company

https://us.gsparkplu...-cr6e-6965.html

I got the Rs as it stops any interference. Apparently

Edited by IronmanG, 16 August 2023 - 10:15 PM.

[IronmanG]

Running the delta ECU.
plugs are NGK C8E
I don’t know the ignition dwell setting in SXtune
No wideband lambda connected to the ECU as SC said didn’t need one once dyno’d
Noble motorsportcars in Chesterfield did the tuning
camshaft was provided by Keith calver as specifically for the 7 port

Did you get the camshaft from Keith directly after speaking to him or did you get it from SC and they said it was for the 7 port?
Is the engine built completely by them or you bought the head and TBs and built yourself?
Definitely change the plugs to 6s see how you go

[Steve220]

Jesus, 8 I way too cold for that set up!! They'll be fowling loads!
You ideally need a wideband for closed loop running. I worry about SC's knowledge of efi tuning.