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Ken Charles! You can run heated or unheated. As David Jacobs states, the MG Metro runs heated. And as David says, you can run either way and see which way is best but, before you do..... you need to understand the effects of water manifold heating and why it exists. It is basically there for economy of operation in light load driving...like around town sort of stuff. As David says, heating the mixture allows for better vaporization of the fuel. True. This allows for a "leaner" mixture for more economical operation (better gas mileage) in part throttle, light load... MORE
A collapsed spring. Hmmm.... I will look into that possibility. What does a collapsed spring look like? Simply broken? What about a sway-bar? Will that help? The other thing that is odd is that when I am going around a slight curve and I hit some bumps, the car seems to *float* or slide a bit - it dose not seem to *hug* the road like I would expect. Maybe I need stickier tires or more weight - I suppose I picked the wrong time to go on a diet... :) Thanks Brad. -Tom "tmruwart" 22648... MORE
Men!! Get a Titan manifold and be done with it. You get proper fit for the application AND excellent flow...all for US$150.00!! I mean...there's "we tight" and there's "we foolish"....the best carb. in the world is not much good without good intake manifold flow and if it won't fit properly, the whole shebang is no good at all, despite what appears on the surface to be "thrift". Cap'n. Bob '60 :{) PilotRob@... 22630... MORE
G'day Dermot There were two different 1098cc engines. The first ones (engine prefix 10CG in a Sprite/Midget) had the same 1.75" main bearing journals, and the same bolt pattern on the flywheel/crankshaft, as the 948cc engine. These engines were fitted to Mk II Sprites, Mk I MG Midgets, Morris Minor 1000 and Austin A40 Farina. The engines were all essentially the same except the Sprite had a different cam grind, and double valve springs. And of course twin SU carbies. It soon became apparent that the crankshafts weren't strong enough for the increase in capacity, so the next generation... MORE
The IF of HIF stands for 'integral float'. It's not a seperate assembly but sits below the throttle assembly, around the jet. There is no way to adjust the float for angle so I guess it's designed to be fairly tolerant of mounting angle. Come to think of it (off the top of my head and it's a while since I've been inside mine) the end of the jet sits in the pool of fuel in the float chamber the top of which is nowehere near the top of the jet as it is in HS carbs. I wonder... MORE
It could or you could fit a spacer, machined to a wedge shape. However the studs would then no longer enter the carb perpendicular to it's face. The kludgy solution to this is to enlarge the mounting holes in the carb. The correct solution is to redrill and tap (probably filling beforehand) the stud mounting holes in the manifold. After all this effort I'd have thought it would be simpler / cheaper to get a suitable manifold. Could the manifold face be machined at an angle to, in effect, rotate the carb, or does this not help move the... MORE
I was wondering the correct engine starting procedure for a 1972 MGB 1800CC 4spd w/electric fuel pump and twin SU carbs. I can usually get it to start with manual choke on third try after pump stops clicking without touching the acceelerator pedal. I was wondering what the original owners manual said, if anything. The car was recently given to me and it has become my duty to bring it back to order. I have rebuilt and adjusted the carbs as well as performed normal tune-up procedures. Your help is appreciated! "nipper6579" 22575... MORE
Hi all What is the difference between a 1098 Midget engine and a 1098 out of say a morris minor. I know the midget runs on twin carbs but will a minor engine fit into a midget and the carbs swap over. Or has anyone got a 1098 Midget engine going cheap in the North West/Manchester. Cheers Dermot. "Dermot" 22567... MORE
Hi guys is this the same group i left, some 2 yrs ago. well im back at my sprite now. anyway just started stripping it to replaace the 2nd cill, and also fitting a 5 speed gear box while at it. So while the engine is out im looking to boost power. ie free flow exhaiust , hi lift cam. & poss hi lift rockers . i intend reusing the twin HS4 carbs but fit k & n Filters. Can anyone tell me of a proven choice of parts. ie f0r fast rd use. If I fit cam is... MORE
yes, late 1275s had a needle roller spigot bush as standard (part No. 13H 4653 or AHU 1026); this has a bigger OD of 0.750" as opposed to 0.625" on earlier engines, so they're not interchangeable. The factory parts catalogue doesn't state when the change occurred, so it's a case of measuring/checking what you've already got. Regards David "David Jacobs" 22521... MORE
OK all, got one. Have any of you EVER heard of a caged needle bearing Pilot Bush/bearing in a STANDARD motor, i.e. DRY CLUTCH set-up as in 948/1098/1275, 1500 Spridget ??? And I DO mean just plain old run of the mill Spridget set-up!! Brad Fornal 22512... MORE
Yep, David... The new cars are definitely far better "runners" for sure. They run efficently on 87 unleaded PON and polute not and are much more safe than ever before BUT.....they are anything but user friendly when it comes to maintenance. They are expensive as hell to maintain when they have a problem. Simply opening up the taps at each wheel and the clutch slave with an empty beer can at each "tap" and waiting for the fluid (drip, drip, drip...slowly but surely as they drain simultaneously at the same time) in the MC to fall to almost the... MORE
Guys... Much too early to tell....we're jumping the gun yet, the government is under pressure with respect to the producing of WMD evidence so I'm sure we'll hear from them in the coming week or so. The people we've captured over there do not know that Saddam and his sons are dead so....I doubt they're doing a lot of "talking" except to "mis-direct". I know I'd feel "less than secure" in their shoes for sure, and I Iraq is a big country in terms of the fact we are looking for needles in a haystack, so to speak. But... MORE
Actually, Jeremy... The crankcase pressure is in and of itself the propellent in a "ventilated" rather than "evacuated" system, the former of which I prefer for exactly the reason you state in your post to Guy Weller....less dilution of already diluted octanes. Fr'instance, I think it was Chris who mentioned dragsters with vacuum pumps hooked up to evacuate crankcase pressure and considering THEIR applications I can well nigh understand this, considering THEIR crankcase pressures!! Whoa, whoa!! :) Obviously, for the normal LBC daily driver this would be overkill but the point is made, though we are talking apples and... MORE
Eeg... Gasoline over here is rated at the pump with a pump octane number (PON) instead of research octane number (RON). Basically, adding 3 numbers to PON will give you a "rough" RON #, according to my mechanic. If any one knows more about this or has other information which can shed further light upon the subject, please chime in! :) So, our "regular" over here is 87PON Our "mid" is 89PON Our "hi" is either 91,92, or 93PON depending on brand. Generally I guess it's 92. I use Cities Service - their "hi-test" is 93PON or approx. 96RON... MORE
Well, Chris... Intelligent routing of "ventilation hoses" (vertical travel) and/or a draught tube run off a "catch can" makes "liquid pollution" a thing of the past in any case. I don't know what everbody else looks for when they check their oil level at least once a week but, I know what I look for besides oil level. The reek of gasoline is all pervading, believe me! If you are not smelling this (it pervades the atmosphere around and within the car, especially on older vehicles which is our subject) or noticing a definite drop off in performance while... MORE
G'day all The clutch line is the same as the brake line. And use plated steel fittings. Now fuel pressure - that's an interesting topic to raise. SU carbies were designed to run with 2.5 to 3 psi of fuel pressure, delivered as it happens via an SU fuel pump. With any more than 3 psi, the fuel can force it's way past the needle and seat in the carbies, fill the float bowl and flood the engine. You might notice the carby flooding, and change the needle and seat to solve the problem, but it is likely that... MORE
Bill B. writes, in part..."Situationally unaware? Age 15! Same thing...:)" Exactly....and should the normal housewife have to worry or concern herself with a crankcase explosion as she ferry's the kids around or goes about her daily chores in keeping a household going? I think not! Chris's point is a valid one and well taken regarding a PCV system, the latter part of his post notwithstanding with respect to a change in induction method replete with non-standard carb. It also keeps the oil more "clean" with respect to it's "useful life" as defined by "contamination". There is always contamination of... MORE
Guy... Those tubes on the carb. which allow crankcase gases into the intake system from the cannister on the timing cover are in and of themselves, "graduated orifices" for a crankcase evacuation. Cap'n. Bob '60 :{) PilotRob@... 22298... MORE
Thanks to everyone offering suggestions for my running problem. I ordered a new carb (identical model) and fitted it this weekend. That cured it. Just seemed the easiest/quickest way out... Alan. "Alan Hearnshaw" 22267... MORE
Chris, Interesting comments. The standard UK set-up has no pcv valve, the hoses just connect direct to vent fittings on the carb barrels. I still feel that the term crankcase "vent" is wrong. It sort of implies that the purpose is to allow excess gasses from the crancase to find their way out. In reality, the system is a much more active "extraction" process, whereby the induction system positively pulls gasses out, creating a negative crancase pressure. Guy "Guy Weller" 22260... MORE
Chris... All of this is true but, I wonder how all those cars prior to PCV systems ever survived, including my much loved and long lasting VW Bug with it's long-lasting, "ventilated" GEX 1600 engine! Not to mention my beautifully running old 1098 that came in my BE all those other pre-PCV equipped cars I've owned including those two great MGA's of yesteryear, who's later varient got the add-on (not "integral" to engine spec. as in modern applications) system. I mean for sure, somebody should have told Henry Ford! :) Do you know how much gasoline you'd have to... MORE
"The oil fumes present in the vented (crankcase) gases...." Yes, this can be a "damned it you do, damed if you don't" sorta thing. That rear engine oil leak can become a real PITA though, and I can understand owners who's engines incorporate the stock "scroll" seal wanting to rid themselves of the problem and general mess. Back when I ran the normal intake manifold mounted PCV valve fed off the oil separator on my '67 "B", we had readily available at the corner pump decent leaded octanes and I never would have given this a thought. Matter of... MORE
C. "Selling A14 engine from my departed MG Midget - recent rebuild; .020- over pistons, all new valves/springs/keepers/seals - has cast iron exhaust manifold, stock intake (non-heated) - reman carb & extra carb. Has remote oil filter included. Engine was run in car for @ 500 miles, no problems. Also have '80 210 5 speed trans available; may sell as package deal. Buyer pays shipping & crating fees. $1000 as engine/trans pkg, engine alone $850. Thanks, Bryan 919/875-1509 evenings - email: determined2win@... " DLancer7676@... 22248... MORE
The scroll on the rear of the crank is an archimedes screw, like a coarse screw thread. As the crankshaft rotates, it tends to "screw" the oil back into the crankcase. The only way to stop rear crank leaks is to maintain negative crankcase pressure. All the various factory crankcase vent systems did this one way or another. On my car ('68 engine) the front cover vent hose runs to the carbs between the piston and butterfly, thus is always under slight negative pressure whenever the engine is running. To prove a point, I once rerouted this vent hose... MORE
