Carb conversion
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Cross-Country
Joined: Mar 2021
Posts: 57
Likes: 6
From: australia
Carb conversion
So while the so called go to f truck specialists were fixing my wiped cam which lasted 15,000 Km I got them to do a Carb swap as I was sick of trying to get the EFi to run right. It has cost me an arm and leg and its completely unreliable as it cuts out every now and then and when I hold it flat for a bit then take my foot off the peddle the idle drops so low that when I come to an intersection it stalls.
The shop put a in tank fuel pump from an 80s Mitsubishi carburetted engine which has not seemed to work so they put a second one in the engine bay sitting on top of the rocker cover to get enough fuel pressure to get it out of the shop right on Xmas.
this is just a rant as I will eventually work it out but pride in work is just going to **** these days.
The shop put a in tank fuel pump from an 80s Mitsubishi carburetted engine which has not seemed to work so they put a second one in the engine bay sitting on top of the rocker cover to get enough fuel pressure to get it out of the shop right on Xmas.
this is just a rant as I will eventually work it out but pride in work is just going to **** these days.
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Cross-Country
Joined: Mar 2021
Posts: 57
Likes: 6
From: australia
Just dropped it off at recommended carb tuning specialist and he couldn't believe the crap work they did.
He has done a number of conversions and puts in a Walbro low pressure pump in tank and said he has no problems.
He was booked out for a month but I think he felt bad for me and my truck.
I should of known about the other place as it was such a mess of a work shop.
He has done a number of conversions and puts in a Walbro low pressure pump in tank and said he has no problems.
He was booked out for a month but I think he felt bad for me and my truck.
I should of known about the other place as it was such a mess of a work shop.
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Cross-Country
Joined: Mar 2021
Posts: 57
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From: australia
After all the stuffing around and money its running very well. Its got some real punch from 3rd gear when overtaking from 40mph.
The cam is the one the shop got me which is a custom grind from a company that went out of business 7yrs ago.
I have no idea whether the cam is a good match but if you take your truck to the shop 4 weeks before xmas with wiped lifters you get what you get and don't get upset.
The cam was from a local engine builder which must of been sitting on the shelf for at least 7yrs. Apparently he said the customer had changed his mind about a lumpy idol.
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Cross-Country
Joined: Mar 2021
Posts: 57
Likes: 6
From: australia
It runs well with good power from 2000 rpm but has excessive pinging from 1500 to 2500 rpm under load.
Im saving for some better heads and roller cam. It will have to do for the mean time.
I thought the mechanic knew what he was doing until I got the truck back and saw what had been done.
ps just checked and it does have the 302 firing order. Is that a drama?
Im saving for some better heads and roller cam. It will have to do for the mean time.
I thought the mechanic knew what he was doing until I got the truck back and saw what had been done.
ps just checked and it does have the 302 firing order. Is that a drama?
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Cross-Country
Joined: Mar 2021
Posts: 57
Likes: 6
From: australia
Thanks for that Paul. I can't get a break with this truck, you put your faith in so called experts and this is what I got.
they didn't even tell me the firing order had been changed.
It does seem to ping less with premium fuel but 25c a litre more.
they didn't even tell me the firing order had been changed.
It does seem to ping less with premium fuel but 25c a litre more.
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Cross-Country
Joined: Mar 2021
Posts: 57
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From: australia
I rang the Camshaft grinder that inherited all the wade cams profiles and he said he could regrind the cam I have in it now to suit the afr 185 heads im going to get. Is that possible?
The lift seems low, how can you add to that?
The lift seems low, how can you add to that?
Cargo Master
Joined: May 2007
Posts: 2,071
Likes: 36
From: British Columbia
The lobe lift is increased by grinding the base circle smaller, which creates its own problems. For instance the lifter will sit lower in its bore when on the base circle, and it is harder for it to follow the lobe profile with a smaller base circle. But camshafts have been reground like this for ages.
Cargo Master
Joined: May 2007
Posts: 2,071
Likes: 36
From: British Columbia
The hydraulic lifters will accommodate a certain amount of alteration in the camshaft base circle diameter, so possibly no other valve train changes will be required. If they cannot maintain zero lash on the base circle of the cam lobes, however, then indeed longer pushrods will be needed.
Camshaft bearings can be left alone since camshaft regrinding is done on the lobes only, not on the bearing journals.
Camshaft bearings can be left alone since camshaft regrinding is done on the lobes only, not on the bearing journals.
Tuned
Joined: May 2017
Posts: 414
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From: C-town,MD
The problem with regrinding the cam is your duration. When you regrind the cam you can only change the duration and lobe separation by a few degrees. And you have a lot of duration for a truck, even with AFR heads. You're probably better off to find a new cam
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From: Southern California
The lobe lift is increased by grinding the base circle smaller, which creates its own problems. For instance the lifter will sit lower in its bore when on the base circle, and it is harder for it to follow the lobe profile with a smaller base circle. But camshafts have been reground like this for ages.
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