'68 Alfa Romeo Gt Junior
Discussion
Is it on 45's?, they tend to be better at high revs and a bit grumbly low down. Unless you are really keen on keeping the originality the later straight air filters give a bit more power and sound nicer than the old cross over style. Just thinking that if you decide to rejet the carbs you might want to look at that modification too as you might need to rejet again if you swapped the filters.
Hi Mitch, Yes it is on 45's currently with the airbox sitting on the other side of the engine bay and the wrapped induction pipe running across the engine.
I do have the cylindrical airbox that affixes the carbs, but suspect this would be for use with original carburetors (Delortos?).
Presently there is little induction noise, mostly exhaust and wind, so I wouldn't be adversed to some snarl from under the bonnet, we had a TR4 on unfiltered 45s and it sounded like a Submarine Spitfire down the bottom of the rev counter http://www.pistonheads.com/gassing/topic.asp?h=0&a... However, I wouldn't want it to dominate too much. What do you think about long trumpets and a foam filter? Too far?
I'm happy with the performance currently as it matches the rest of the aspects of the car, but suspect it'll run sweeter after its been through my friends workshop. He currently has a 70s Tyrrel F1, 3 Hispano Suizas (sp?) a Ferrari 308 and my Dad's Spectre at his place. Its always interesting to pop by. He tunes carbs on his rolling road.
I do have the cylindrical airbox that affixes the carbs, but suspect this would be for use with original carburetors (Delortos?).
Presently there is little induction noise, mostly exhaust and wind, so I wouldn't be adversed to some snarl from under the bonnet, we had a TR4 on unfiltered 45s and it sounded like a Submarine Spitfire down the bottom of the rev counter http://www.pistonheads.com/gassing/topic.asp?h=0&a... However, I wouldn't want it to dominate too much. What do you think about long trumpets and a foam filter? Too far?
I'm happy with the performance currently as it matches the rest of the aspects of the car, but suspect it'll run sweeter after its been through my friends workshop. He currently has a 70s Tyrrel F1, 3 Hispano Suizas (sp?) a Ferrari 308 and my Dad's Spectre at his place. Its always interesting to pop by. He tunes carbs on his rolling road.
Just read the TR4 thread, excellent 
we see a few TR4's on the Rally circuit and they can be very competitive if driven right, bit heavy though, well over a Tonne I was told by a guy who runs one on the stages, it's the separate chassis which does it.
Back to the Junior, I reckon the 1750 wouldn't be much different to the TR on trumpets, mine's loud on K&N's and as a road car you would quickly get fed up with the racket. My 1750 came with the standard cross over filter and as you say most of the noise is wind and exhaust, which isn't ideal as induction is the nicer sound when you can hear it. I changed mine to the cylindrical filter with additional holes drilled to give more airflow (Alternatively leave the end off!). There was a nice rewarding throaty roar under load, not to much of the blare you get with the open filters, just enough to hear the carbs breath. I'm pretty certain the cylindrical filter you got with the car should fit, there certainly isn't a differance between the fittings for Dellorto's or Webers, but the aluminium plenums are not interchangeable between cross over and cylindrical, so if you just have the black cylinder you need the plenum too.
I don't think 45's differ from 40's on the fittings either, so in theory you could swap them over in a half an hour so and check out the difference in sound. You might find your carb prop won't fit though so don't leave it on for long without a prop or you will damage the rubber mounts, another slight problem might be the washer bag as there isn't room for that and the cylindrical air filter on the same side, not unless you want to develop a water injection system like I did!!.. the movement of the engine squirted water out of the bag as the filter rocked against it!.
There's as much pleasure to be had tinkering around with these things as driving them
we see a few TR4's on the Rally circuit and they can be very competitive if driven right, bit heavy though, well over a Tonne I was told by a guy who runs one on the stages, it's the separate chassis which does it.Back to the Junior, I reckon the 1750 wouldn't be much different to the TR on trumpets, mine's loud on K&N's and as a road car you would quickly get fed up with the racket. My 1750 came with the standard cross over filter and as you say most of the noise is wind and exhaust, which isn't ideal as induction is the nicer sound when you can hear it. I changed mine to the cylindrical filter with additional holes drilled to give more airflow (Alternatively leave the end off!). There was a nice rewarding throaty roar under load, not to much of the blare you get with the open filters, just enough to hear the carbs breath. I'm pretty certain the cylindrical filter you got with the car should fit, there certainly isn't a differance between the fittings for Dellorto's or Webers, but the aluminium plenums are not interchangeable between cross over and cylindrical, so if you just have the black cylinder you need the plenum too.
I don't think 45's differ from 40's on the fittings either, so in theory you could swap them over in a half an hour so and check out the difference in sound. You might find your carb prop won't fit though so don't leave it on for long without a prop or you will damage the rubber mounts, another slight problem might be the washer bag as there isn't room for that and the cylindrical air filter on the same side, not unless you want to develop a water injection system like I did!!.. the movement of the engine squirted water out of the bag as the filter rocked against it!.
There's as much pleasure to be had tinkering around with these things as driving them
Beautiful car and I am in no way jealous. I've been pining for one for years. One day I'll be able to but not quite yet.
You're asking about period radios... Might I suggest a foray in this direction?
http://www.mcintoshlabs.com/us/Products/pages/cate...
You're asking about period radios... Might I suggest a foray in this direction?
http://www.mcintoshlabs.com/us/Products/pages/cate...
Well, I got the car back from its first fettle, and the work I've had done has definately been an improvement.
Here's a list:
- Electronic ignition fitted to replace points, neatly fitted into the distributor housing
- New seat crossmembers made and Corbeau Alpine seats fitted - tight fit, but hold you in well and are comfy. Much better lower and further back in the car
- Quarterlight repaired, so less wind noise from the frame
- Door opener rods relocated and fettled to fix external and internal handle issues
- Inside of doors cleaned and waxoiled
- Door drains opened up, cleaned and sealed
- Carbs adjusted
I think it'll be after Christmas now, but next on the hit list will be:
- Clutch
- Clutch pedal placement
- Replace perished rubbber carb mounts
Plus a few other bits
In the meantime, I've got a small front number plate and a headlight bulb to replace, and a few stonechips to fill.
I've been trying to track the history of the car, as the file I have suggests it was a special order, with the earlier flat dash, 15" wheels and some other performnace bits. The car has changed colour twice since then and currently has Alfaholics GTA style alloys, so is far from original. I'd be nice to know how it was when it left the factory. I have the details back from Alfa Romeo about build date and that the car was delivered to a dealership in London, but that's as far as I've got. Next thing to do is request a list of previous owners through DVLA, and see if I can get in touch somehow.
I managed to find a bit of time to clean and photograph the car, so here are the latest offerings.
Here's a list:
- Electronic ignition fitted to replace points, neatly fitted into the distributor housing
- New seat crossmembers made and Corbeau Alpine seats fitted - tight fit, but hold you in well and are comfy. Much better lower and further back in the car
- Quarterlight repaired, so less wind noise from the frame
- Door opener rods relocated and fettled to fix external and internal handle issues
- Inside of doors cleaned and waxoiled
- Door drains opened up, cleaned and sealed
- Carbs adjusted
I think it'll be after Christmas now, but next on the hit list will be:
- Clutch
- Clutch pedal placement
- Replace perished rubbber carb mounts
Plus a few other bits
In the meantime, I've got a small front number plate and a headlight bulb to replace, and a few stonechips to fill.
I've been trying to track the history of the car, as the file I have suggests it was a special order, with the earlier flat dash, 15" wheels and some other performnace bits. The car has changed colour twice since then and currently has Alfaholics GTA style alloys, so is far from original. I'd be nice to know how it was when it left the factory. I have the details back from Alfa Romeo about build date and that the car was delivered to a dealership in London, but that's as far as I've got. Next thing to do is request a list of previous owners through DVLA, and see if I can get in touch somehow.
I managed to find a bit of time to clean and photograph the car, so here are the latest offerings.
It was like that when I got the car, and seemingly does little for the positioning. I've heard of a short pedal or some such thing, but I think that would shorten the pedal travel.
Wish I had the time to work on the car myself, but too busy working to fund it and everything else. Isn't that always the way? Efficient though.
My mechanic would like to reposition the clutch pedal. At present you really have to push into the carpet to get a good change. The car is proving a reliable and fun companion and I use it a few days a week at present. I reacon it'd be rather ace in the snow as well with thinner tyres. Good so long as I could avoid the salt.
Wish I had the time to work on the car myself, but too busy working to fund it and everything else. Isn't that always the way? Efficient though.
My mechanic would like to reposition the clutch pedal. At present you really have to push into the carpet to get a good change. The car is proving a reliable and fun companion and I use it a few days a week at present. I reacon it'd be rather ace in the snow as well with thinner tyres. Good so long as I could avoid the salt.
Edited by joesnow on Thursday 13th October 13:17
joesnow said:
Setting the car at at indicated 70 I was being overtaken by everyone. Curious to eveyone's hurry, I turned on the satnav I had with me, and that was indicating 55mph. Oh! An indicated 90 was better, the car easily coping with 70mph+ at around 4000 rpm. I put this down to the engine and gearbox change from the 1300 to the 1750. Mental note number 1.
I used my phone speedo the other day in my GTJ, although my speedo is in clicks, its out about the same. so I have to do about 135kmh to register 70mph.Its for android, called speedview.
Perfect for classics, has 5 display types, the one I use in the junior has a HUGE mph number, as well as heading, alt and odometer.
It also has 0-60function and qtr mile.
Ive tried loads of android based speedos, this is far and away the best and most practical.
Perfect for classics, has 5 display types, the one I use in the junior has a HUGE mph number, as well as heading, alt and odometer.
It also has 0-60function and qtr mile.
Ive tried loads of android based speedos, this is far and away the best and most practical.
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