1970 Alfa Romeo Giulia 1300 TI
Discussion
RicksAlfas said:
Looking good!
I find it easier to fit the carbs and throttle linkage to the manifold on the bench and then offer the whole lot up in one go. That way you've only seven nuts to do up whilst leaning at an awkward angle over the car.
Yep, I put this in the fitting guide for ours. Lots of people just bolt them up and wonder why the carbs won't quite fit. It's not an issue with the rubber ones because you can bend them around but the aluminium ones are completely stuck in place once they're done up tight so need to be in the RIGHT place! I find it easier to fit the carbs and throttle linkage to the manifold on the bench and then offer the whole lot up in one go. That way you've only seven nuts to do up whilst leaning at an awkward angle over the car.
RicksAlfas said:
Looking good!
I find it easier to fit the carbs and throttle linkage to the manifold on the bench and then offer the whole lot up in one go. That way you've only seven nuts to do up whilst leaning at an awkward angle over the car.
I find it easier to fit the carbs and throttle linkage to the manifold on the bench and then offer the whole lot up in one go. That way you've only seven nuts to do up whilst leaning at an awkward angle over the car.
Mound Dawg said:
Yep, I put this in the fitting guide for ours. Lots of people just bolt them up and wonder why the carbs won't quite fit. It's not an issue with the rubber ones because you can bend them around but the aluminium ones are completely stuck in place once they're done up tight so need to be in the RIGHT place!
Ah yes that makes more sense. I think at the time I was worried about access to re do the coolant pipes etc. The carbs definitely fit thankfully! But yes fitting them as one definitely sounds more efficient! I will see how I get on.
Well, after a pretty miserable Christmas. Bed bound with a stomach bug! I was glad to be able to get back in the garage and get cracking with the Alfa again.
I was particularly excited to get back in the garage, as I knew there were only a couple of little jobs left before the twin carbs could be mounted up properly. hopefully for the last time.
The first thing to do was fit a fused wire from the starter to power the electric fan. I plan on wiring up the fan after the carbs are fitted, but access to the starter is fairly limited once the carbs are fitted, so I thought it best to at least get that wire in place before the carbs go on.
Being my first foray into wiring, I had the plenty of new kit to buy. I decided to go the crimping route, as apposed to soldering. And it seems to have worked out well.
Pretty simple, just a suitable connector fitted to the fuse holder then crimped on a wire extension. But I’m happy with how it turned out for the first try.
Once the wire was done, I fitted it up to the starter and ran it through to the radiator area, where I can come back to it later once the fan is ready to be wired.
With that done, the next small item on the list was fit a hose from the vaccum take of point from the inlet manifold to the distributor with the pulse damper in between.
The hose is for the Vaccum advance on the distributor, which from what I understand, advances timing on small throttle openings in high gear and cruising, ie high engine load situations. helping to reduce knock and improve fuel economy (I think?)
Originally I don’t think twin carbs came with vaccum advance distributors, only single carb cars had them. And the vaccum takeoff with the single carb is just under the butterfly’s so it’s a nice clean vaccum. Whereas on the twin carb inlet the only vaccum takeoff point is on cylinder one only, so my thoughts are that the pulse damper will smooth that single cylinder vaccum out enough for the vacuum advance to still work correctly. But we will see!
With those bits taken care off it was on to fitting the twin carbs!
I was sure to leave a couple of mm gap between the metal
Cups that sit over the big rubber washers, that way the the carbs sit on the rubber O-rings on the carb mounts with a few mm between the actual carb body and the mount itself. Helping to dampen vibration slightly.
Both carbs fitted, luckily I didn’t have any issues fitting them after the inlet manifold, rather than fitting them both together as one unit. Although that method would have been much easier for sure, access to the lower mounting bolts was quite a challenge. Something to remember for next time!
With the carbs fitted the only thing left was to fit the GTA trumpets, gasket and back plate. They will
More than likely have to come off again to fine tune the throttle linkage, but needed to double check clearance and couldn’t resist a chance to see how they will look on the car!
That’s it for today. Good progress! Glad to get the carbs on, can’t wait to hear how it sounds! Next up is wiring up the electric fan, refitting the radiator etc then it should be ready to start up and tune!
I was particularly excited to get back in the garage, as I knew there were only a couple of little jobs left before the twin carbs could be mounted up properly. hopefully for the last time.
The first thing to do was fit a fused wire from the starter to power the electric fan. I plan on wiring up the fan after the carbs are fitted, but access to the starter is fairly limited once the carbs are fitted, so I thought it best to at least get that wire in place before the carbs go on.
Being my first foray into wiring, I had the plenty of new kit to buy. I decided to go the crimping route, as apposed to soldering. And it seems to have worked out well.
Pretty simple, just a suitable connector fitted to the fuse holder then crimped on a wire extension. But I’m happy with how it turned out for the first try.
Once the wire was done, I fitted it up to the starter and ran it through to the radiator area, where I can come back to it later once the fan is ready to be wired.
With that done, the next small item on the list was fit a hose from the vaccum take of point from the inlet manifold to the distributor with the pulse damper in between.
The hose is for the Vaccum advance on the distributor, which from what I understand, advances timing on small throttle openings in high gear and cruising, ie high engine load situations. helping to reduce knock and improve fuel economy (I think?)
Originally I don’t think twin carbs came with vaccum advance distributors, only single carb cars had them. And the vaccum takeoff with the single carb is just under the butterfly’s so it’s a nice clean vaccum. Whereas on the twin carb inlet the only vaccum takeoff point is on cylinder one only, so my thoughts are that the pulse damper will smooth that single cylinder vaccum out enough for the vacuum advance to still work correctly. But we will see!
With those bits taken care off it was on to fitting the twin carbs!
I was sure to leave a couple of mm gap between the metal
Cups that sit over the big rubber washers, that way the the carbs sit on the rubber O-rings on the carb mounts with a few mm between the actual carb body and the mount itself. Helping to dampen vibration slightly.
Both carbs fitted, luckily I didn’t have any issues fitting them after the inlet manifold, rather than fitting them both together as one unit. Although that method would have been much easier for sure, access to the lower mounting bolts was quite a challenge. Something to remember for next time!
With the carbs fitted the only thing left was to fit the GTA trumpets, gasket and back plate. They will
More than likely have to come off again to fine tune the throttle linkage, but needed to double check clearance and couldn’t resist a chance to see how they will look on the car!
That’s it for today. Good progress! Glad to get the carbs on, can’t wait to hear how it sounds! Next up is wiring up the electric fan, refitting the radiator etc then it should be ready to start up and tune!
velocemitch said:
Looking lovely, they will sound great!.
Interesting that you took the power for the fan from the Starter lead rather than straight from the battery terminal. Why was that?
Thanks mate, ah it was just in the name of neatness to be honest! I’m not going to use any switched power for the fan, plus the fan will be on the left side of the rad. So I will be able to keep all the wiring for the fan andInteresting that you took the power for the fan from the Starter lead rather than straight from the battery terminal. Why was that?
Relay on the left of the engine bay and hidden away. Rather than having wires running from the battery and fuse box running accross the engine bay.
Managed to sneak in a couple of hours on the Giulia this afternoon, so I got a few jobs completed.
First up was cutting the lower coolant hose to fit the thermo switch for the electric fan, then adding the wiring before it goes on.
Then it was on to getting the fan fitted up to the radiator.
Test fitted the rad to double check the hose fitment and length of the wires, then fitted the modified bottom hose.
Then got the rad bolted in and the top and bottom hoses fitted.
Next up was the fan wiring at relay, I cut down all the wires I had previously fitted, crimped on the connectors and got the relay wired up and mounted.
With that all done the only things left to do now is re-fill
The coolant and start it up! then it’s on to balancing and tuning the carbs and all that fun stuff!
First up was cutting the lower coolant hose to fit the thermo switch for the electric fan, then adding the wiring before it goes on.
Then it was on to getting the fan fitted up to the radiator.
Test fitted the rad to double check the hose fitment and length of the wires, then fitted the modified bottom hose.
Then got the rad bolted in and the top and bottom hoses fitted.
Next up was the fan wiring at relay, I cut down all the wires I had previously fitted, crimped on the connectors and got the relay wired up and mounted.
With that all done the only things left to do now is re-fill
The coolant and start it up! then it’s on to balancing and tuning the carbs and all that fun stuff!
Over the last couple of days I managed to get well
Into the final stretch with the twin carbs.
First thing was to refit the battery with a new cutoff.
Then I fitted a ‘choke’ cable to the twin webers. It’s actually more of an enrichment on the webers rather than a choke, and by all accounts is best left alone with these old Alfas, it’s not really needed apparently, but I wanted to fit a cable so it looks correct.
And the last thing before the first start, refilling with coolant.
Ready for the first start!
Unfortunately the first start didn’t go quite to plan, as you can see from the video, the car wasn’t running well at all, even without the carbs being balanced or tuned. The car didn’t seem to want to idle, the revs were hanging badly and the fuel pressure was all over the place and the adjustable regulator didn’t seem to be working correctly. But on the plus side, the fan kicked on whilst I was working away at the carbs, so that works!
After much head scratching, I took a look at the diagram of the filter king filter fuel pressure regulator to see how it actually works, and noticed it features a tiny spring under the adjustment rod. which looked remarkably like a tiny spring I found on my workbench shortly after ‘rebuilding’ the fuel Pressure regulator a few weeks ago. so it’s my mistake, I didn’t put two and two together at the time. With no spring and no adjustment, the diaphragm and ball bearing controlling the fuel pressure would just be flapping around letting random globs of fuel through, so the problems I had with the first start make sense! Anyhow, I decided to order a new pressure regulator to be on the safe side.
Cut to 24 hours later, and the new regulator arrived. So I went ahead and swapped out old for new.
With that done, I fired up the car again and Voila! It sounds much much healthier, and the fuel pressure is sitting at a steady 3 psi.
Unfortunately at this point I ran out of time! So hopefully tomorrow I will be able to give the carbs a tune, remove the fuel pressure gauge and fit a normal hose, then fit the trupets, then I think that will be a wrap on the engine side of things.
Into the final stretch with the twin carbs.
First thing was to refit the battery with a new cutoff.
Then I fitted a ‘choke’ cable to the twin webers. It’s actually more of an enrichment on the webers rather than a choke, and by all accounts is best left alone with these old Alfas, it’s not really needed apparently, but I wanted to fit a cable so it looks correct.
And the last thing before the first start, refilling with coolant.
Ready for the first start!
Unfortunately the first start didn’t go quite to plan, as you can see from the video, the car wasn’t running well at all, even without the carbs being balanced or tuned. The car didn’t seem to want to idle, the revs were hanging badly and the fuel pressure was all over the place and the adjustable regulator didn’t seem to be working correctly. But on the plus side, the fan kicked on whilst I was working away at the carbs, so that works!
After much head scratching, I took a look at the diagram of the filter king filter fuel pressure regulator to see how it actually works, and noticed it features a tiny spring under the adjustment rod. which looked remarkably like a tiny spring I found on my workbench shortly after ‘rebuilding’ the fuel Pressure regulator a few weeks ago. so it’s my mistake, I didn’t put two and two together at the time. With no spring and no adjustment, the diaphragm and ball bearing controlling the fuel pressure would just be flapping around letting random globs of fuel through, so the problems I had with the first start make sense! Anyhow, I decided to order a new pressure regulator to be on the safe side.
Cut to 24 hours later, and the new regulator arrived. So I went ahead and swapped out old for new.
With that done, I fired up the car again and Voila! It sounds much much healthier, and the fuel pressure is sitting at a steady 3 psi.
Unfortunately at this point I ran out of time! So hopefully tomorrow I will be able to give the carbs a tune, remove the fuel pressure gauge and fit a normal hose, then fit the trupets, then I think that will be a wrap on the engine side of things.
Managed to get the carbs tuned and balanced today and the trumpets fitted. The only thing left to do is swap out the fuel pressure gauge and then hopefully road test!
Next things on the list are fitting the new headlights and bulbs, plus rebuilding the grills and getting those fitted. Then hopefully I can take a break from working on the car and drive it!
Next things on the list are fitting the new headlights and bulbs, plus rebuilding the grills and getting those fitted. Then hopefully I can take a break from working on the car and drive it!
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