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Duncan I'm not really sure either, but I think it's by 'application' ie what car they were fitted to. eg AUD136 was fitted to the Midget MkII, 1098, 1964 and AH Sprite MKIII 1963/4 and MKIII, 1968/9 Needle sizes were RICH H6, STD AN, Weak GG Blue Spring Colour AUD266 was fitted to the Midget MkIII, 1275 USA spec 1968 Needle sizes were STD AN, Blue Spring AUD328 was fitted to the Midget MKIII, 1275 USA spec, 1968/9 Needle sizes were STD AAC, Blue Spring From what I can tell all the HS2 throttle sizes were 1/1/4. All info... MORE
From: amukdigiphoto [mailto: amukdigiphoto@... ] Sent: Wednesday, December 10, 2003 5:46 AM To: midgetsprite@yahoogroups.com Subject: [midgetsprite] Re: SU Question Duncan I'm not really sure either, but I think it's by 'application' ie what car they were fitted to. eg AUD136 was fitted to the Midget MkII, 1098, 1964 and AH Sprite MKIII 1963/4 and MKIII, 1968/9 Needle sizes were RICH H6, STD AN, Weak GG Blue Spring Colour AUD266 was fitted to the Midget MkIII, 1275 USA spec 1968 Needle sizes were STD AN, Blue Spring AUD328 was fitted to the Midget MKIII, 1275 USA spec, 1968/9 Needle sizes... MORE
Thanks to Pilot Rob, Duncan, and David C. for responses. To answer collectively, fuel is being fed to the carb. Last time running wasn't too long ago. I removed the brake MC for resleeving/rebuild at the time, and decided then to address the pedal box area corrosion. I have not yet tried, as Duncan suggested, to hold No1 wire close to the block (3/8") and check for a spark. Since I haven't mucked with anything near the plugs/dizzy/carb, suspect lack of juice to the plugs is not the issue. I'm going to swap out the coil to see if... MORE
From: Pete Skalski [mailto: pskalski@... ] Sent: Tuesday, December 09, 2003 7:41 PM To: midgetsprite@yahoogroups.com Subject: [midgetsprite] Re: 1500 - Low voltage troubleshooting - Help Thanks to Pilot Rob, Duncan, and David C. for responses. To answer collectively, fuel is being fed to the carb. Last time running wasn't too long ago. I removed the brake MC for resleeving/rebuild at the time, and decided then to address the pedal box area corrosion. I have not yet tried, as Duncan suggested, to hold No1 wire close to the block (3/8") and check for a spark. Since I haven't mucked with... MORE
Hi, I have a question relating to SU HS2 carbs. Is there a way to tell what the differences between the model numbers are by the numbers themselves. For example how can you tell the difference between the AUD136,AUD266 and ADU328? They are all HS2 after all Is it just needle size and spec, jet size that differ? Any advice appreciated TIA Duncan "Duncan Sinclair" 27417... MORE
Anyone have a resource for rebuilt carbs for an RX7? We gave the 85 to our daughter and son in law and he is having trouble finding one. All of the local suspects say they cannot rebuild one of his carbs. Robert Houston The Supreme Court ruled there cannot be a nativity scene in Washington,DC this Christmas. This isn't for any religious or constitutional reason, they simply have not been able to find three wise men or a virgin in the nation's capitol. There was no problem however finding enough asses to fill the stable rbhouston@... 27396... MORE
Jim... OK...you want to run "vented" instead of "closed loop" but wish to retain the charcoal cannister and use it as a catch can either in it's present position or possibly elsewhere in the engine compartment. Fine...but you MUST promise to read the last paragraph! :) I am strictly a layman in the post '67 emissions systems which were strapped to our engines as "add on" devici, providing for a "closed loop" system to ensure crankcase/fuel tank vapor evacuation into the combustion process. Ripped it out myself, and never used one. I took a look at it under the... MORE
Hi Nigel, I've got to say that I agree with David. When I first read it I thought like you, but on reading it again I have to agree with the fact that in it's basic form it aint no rocket! It's also true to say that it has only become "cool" in more recent years and the characteristic "Frog eyes" were solely down to economics and US laws on headlight height rather than any intentional styling foresight. Please someone correct me if I've got that wrong. By the way, my Frogeye was on Channel 5's "Fifth Gear" programme... MORE
Bob, Thanks for your reply. Maby my question was not clear enough. There is no fuel leaking in the engine compartment. It is either vaporizing in the float bowls or draining down inside the intake manifold. I took one carb apart last night and i suspect it is the two O-rings that seal the main jet. Part # 16 on the moss website. If these are old and hard fuel will have to leak by. I would think that anyone using an electric fuel pump with this style of carby could have this problem and not even know it.... MORE
Guys... Isn't there an anti-drainback valve in the 948's mechanical fuel pump? It's been 40 years for me so I've forgotten! :) But I think there may be one, Chris. And with no disrespect intended Chris, why would anyone run an engine with possible fuel leaks in the engine compartment? You don't EVER want to do this, man. Disaster doesn't always strike the "other guy"! :) I mean if you look just below the carbs, you'll find the exhaust system!! Speaking of which.... Invest in a portable FIREX as well that you can affix to, and carry around in... MORE
I'm not sure of the compression ratio but the head has been milled 0.080 and the cylinders are 0.040 larger. I'm using the valves for the 1098 head and running 1 1/2 SU's. The combustion chambers have all been opened up and balanced but I don't remember their size and won't be able to measure them until I get the new valve guides and lead free valve seats installed. I'll have to compute the compression ratio when I can make careful measurements. Thanks for the info. Nelson "Nelson Wittstock" 27116... MORE
Nelson... Well, "knock" is pretty well tied to compression ratios and timing along with octanes of course, but you already know this. You are looking at a cam with numbers similiar to a Kent #276. The lift numbers may be the other way around but this is a minor point (usually a bit more lift for exhaust rather than inlet, when cam is assymetric, 'cause exhaust valve is smaller I guess?). This is a very fast road cam, similiar to what an APT VP3 or Kent #286 would be for a 1275, more or less. Minimum compression ratio for... MORE
The Concord (in principle) is not done, percieved "national attitude" notwithstanding. It's timing was bad among other world events. Had times been good and/or had they been able in enlarge it (more passengers) or develop a more fuel efficient engine(s) for it (R&D costs at a time when there was no money?), the larger capacity or more fuel efficient versions would be flying today. OTOP ("paw" - obligatory cat content, Guy Weller...I caught that "chock" comment, fella....watch it!!:).... "today" , we have email and electronic conferencing. You can see how circumstances combined against supersonic international global flight world-wide. At... MORE
Alan... Which came first? The chicken or the egg? :):) Oil is basic power for production...of nearly anything and everything. There are other factors of course like normal inflation, with or without the cost of basic power tripling over a short period. Oil was US$ 9.00 bbl. back in the early 60's, if that. Airline kerosene was US 15 cents a US gallon under fleet purchase, if that, back then. As a kid, leaded high test ran about 40 cents a gallon or so. The foregoing notwithstanding, the modern cars of today are far safer/better machines for sure. Part... MORE
What in the world does gargling with 50/50 mix of polident/Jet A-1 have to do with the twins? "Virginia" 26846... MORE
Hey!!! Implants? Then GARGLE a 50/50 mix of Polident/Jet A-1....geeesh....gotta spell it out for you!? Use a little imagination for God's sake. Doctors are busy people... we can't be bothered with patients!! DoctorBob '60 {:) PilotRob@... 26818... MORE
"You guys make my teeth hurt" No problem. Take them out and soak them overnight in a 50/50 mixture of Polident and Jet A-1 (kerosene). They'll be fine! DoctorBob '60 {:) PilotRob@... 26805... MORE
Thanks Nigel, Yes, sentimentality does enter into it. My father gave me this Sprite as a high school graduation present some 23 years ago. He actually gave it to me in pieces, and we rebuilt it together, which brought us closer, considering I was living with my mother after their divorce. So it's not just a car, it's a family heirloom! In the last three years I have installed performance suspension front and rear, uprated brakes, Weber, and LCB exhaust header. Now the drivetrain is out to rebuild the engine and install the Datsun 5- speed. Looking more closely... MORE
Well Martyn.... the off-center butterflies seems to have been the culprit and spare set of carbs. notwithstanding, Dave Jacobs suggestion certainly seems to have merit should you wish to straighten out the Vizardized ones and continue to run them. The VP3 is about as far as you can go and still have a decent street driver, and this with respect to a 1275, wherein the idle is most definitley "lopey" at 1000rpm. This will be even more more so on the smaller bore 1098....IOW, the rpm at idle 1000rpm) WILL vary....it's expected (I sort of like that "lopey" sound... MORE
If you hadn't had a spare set of carbs, you could probably salvage the faulty carb fairly easily. All you'd need do is open out the screw holes in the butterfly so it can move up and down a bit, assemble it with the screws done up loosely, hold the butterfly firmly in the closed position then loctite to the shaft. David "David Jacobs" 26533... MORE
Well, I took the carbs off and found that when the machine shop had bored the bodies for oversize shafts they did a very poor job. The center of the bore was shift a few thou up which caused the butterfly not to seal on the bottom. That job was done many years ago. Fortunately I have a another set of carbs that I can use. The engine no can be made to idle just about where I want it although with the cam (VP3 in a 1098) it doesn't like low idle speeds, greater than 900 is good.... MORE
OK ok ok as you're being so helpful I'll call ya Ed : ) You'll just have to excuse my 'somewhat' naive questions regarding what you consider to be second nature. I am not a mechanic, never have been nor will ever be one. Bodywork, welding, spraying, upholstery I can do, mechanics I learn as I go along, which is why I'm so dependant on workshop manuals. Unless the manual spells out what you have to do, I'll get confused (which isn't hard)! Now whats the end-float got to do with anything? Nigel "amukdigiphoto" 26484... MORE
Hi, Bob.... Yes the return springs are installed I have new ones to put in. The butterflies have been modified per Vizard, I wonder if that might have anything to do with the problem. The fast idle screws are not even touching the cam. Something must be holding the butterfly open a little. Off come the carbs tomorrow. Martyn "Martyn Eastwood" 26450... MORE
Maybe it is time to consider a 45 weber + a dyno session to set it up correctly ??? "beckers" 26435... MORE
Hi, Martyn... Your understanding of the spring as stated is correct. But, as can be seen, this has nothing to do with idle. While the accelerator cable is not connected, the throttle return springs are.......correct? Cap'n. Bob '60 :{) PilotRob@... 26449... MORE
