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Re: High Hydrocarbons

Posted: Sat Sep 12, 2020 21:00
by Hawaiis0
Get a replacement . Repairs last as long as a box of quality streets on Christmas day.

Re: High Hydrocarbons

Posted: Sat Sep 12, 2020 21:09
by KLM
I agree, I've been reading up on people who have used various techniques of repair and most say get it replaced. so I will ring eurocarb on Monday.

I do have a set of throttle bodies and fuel rail in my garage though but I think I still need the car mobile if I was going to fully convert it, I mean I couldn't do it as I don't have the knowledge.

Re: High Hydrocarbons

Posted: Wed Nov 11, 2020 18:01
by KLM
I have taken another look at the cam timing today, the pictures I took on page 1 showing the cams slightly out, well I used a ruler across the centre's and the timing marks are still out. so I am going to get the cam belt replaced early in the new year.

I have found out that low co and high hydros are a result of either an intake leak or timing is out. I have been round the intake system with wd40 and checked everything twice. I am also back on mapped ignition which was set before the last cam belt change and was perfect so im struggling to see how a map would be out.

so I am really hoping that getting them cams lined up properly will resolve my issue.

Re: High Hydrocarbons

Posted: Mon Feb 01, 2021 10:39
by KLM
I have an update.

i was not happy with the cam timing that you could see in the photo's. that cambelt was fitted by the garage that rebuilt my engine, before they touched the car the cam sprockets used to line up perfectly, so i really wanted to get that cambelt changed. i decided to ask my go to mot station if he wanted to take on the job, he said yes and i sourced the belt and tensioner bearing. (belt from lotusbits, bearing from Gary Kemp, both ordered via theyre ebay shops and arrived within a week, £60 each ).

The garage fitted new belt and they charged 3hrs @£60 ph, although i was told it did take the mechanic nearly all day :shock: apparently he struggled with access.

Anyway the cam sprockets are much closer aligned now.

after the cambelt went on he fired up the gas analyser. and wow, co was 1.8 and hydrocarbons were now 230 from a co of 3.5 max and hydro of 1200.

so as you can imagine i am very happy that that issue is now resolved.

one more thing.

i have mapped ignition, and i was told that the vacuum piped on the carbs could be removed and blanked off, is that correct ?

Re: High Hydrocarbons

Posted: Mon Feb 01, 2021 11:47
by Pete Boole
Wow - those differences are incredible! I wouldn't have thought it could make that much difference. Thanks for the update :D

Pete

Re: High Hydrocarbons

Posted: Mon Feb 01, 2021 13:17
by richardw
KLM wrote:
Mon Feb 01, 2021 10:39


i have mapped ignition, and i was told that the vacuum piped on the carbs could be removed and blanked off, is that correct ?
Almost certainly yes. Could you advise what ignition system you are using - I guess it’s not distributor based as you have a trigger wheel.

Richard

Re: High Hydrocarbons

Posted: Mon Feb 01, 2021 14:35
by KLM
Hi

i used a place near me call efi-parts.com, he specialises in ecu's ect. when i went to him he said he didn't normally do what i was asking, but he did it anyway and tbh he was fantastic. he recommended a adaptronics e420d for my price range as it had more functions if i went full efi. he made a custom loom with the fuel injection side for future use, he made a custom coil pack bracket, He has his own rolling road, which we used to try different idle jet size and main jet sizes. so he supplied and fitted the ecu/loom, trigger wheel, crank sensor and bracket, its a ford wasted spark coil pack . he also made all the ignition leads, and he also made a custom trigger wheel with some special bolt so that i could use my original crank pully. it was incredible the lenghs he went to especially for the price i supplied the tps from eurocarb, he then mapped it all . and then he knocked off £100 from the original quote of £1300. unfortunately he does not do conversions like mine anymore ( lol i wonder why )

Hpwever he is still in business and you can buy pretty much everything you need from his website.

moving onto the jet sizes , as i have just mentioned we spent an extra hour on the rolling road seeing what difference various different sizes of idle and main jets made. this was on my engine before the rebuild, however the engine builder once he had dismantled it mentioned it was actually in really good condition and looked to have done about 50k. so the 55 idles jets had a flat spot around 2.k revs as many here will know. the 58's improved this, 60's did not do anything above the 58's. Main jets are 135 standard then i think the next size is 138's i wanted to see if having just gone mapped ignition, what difference bigger main jets made. they made no more hp but increased fueling so it went back to 135's.

Re: High Hydrocarbons

Posted: Mon Feb 01, 2021 16:59
by richardw
Very interesting! Had not come across adaptronics before but it looks a decent setup. Good feedback on the different jet sizes and their impact.

I can’t find documentation on the ecu that talks about vacuum. Where does your vacuum pipe end up? Presumably the distributor has been removed so I’d imagine your installer will have blanked it off anyway otherwise your rolling road tuning would have been all over the place. I think the vacuum system on the Excel SE does a few things as well as timing advance so it may be best just to leave the end that used to connect to the distributor secured and blanked.

Cheers, Richard

Re: High Hydrocarbons

Posted: Tue Feb 02, 2021 22:20
by KLM
Hi

i actually left the distributer in place and the coil, 2 reasons, firstly removing the distributor requires a blanking plate and secondly and most importantly , if anything on the ecu side goes i can just re-route the ht leads and be on my way again, so the vacuum system is just the same as standard but the distributor isnt doing anything .