Club126UK
Fiat 126 Chat => Tuning & Customising 126 Models => Topic started by: Rusty's Uncle on June 17, 2011, 02:31:32 PM
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My tuned up little 499ccs engine is running a treat at the moment but the original 100,000+ miles non syncro gearbox has decided to spit out oil onto the new clutch I had fitted which is most annoying but not unexpected as the box is quite crunchy and jumps out of 2nd (especialy when cold for some reason) . So I just bought a 652ccs engine which was alledged to be fully reconditioned. The engine has some new parts like pistons & barrels but if sheared studs, missing nuts & bolts, stripped threads etc etc is the seller's idea of recon then he is a t**t & lucky he is not on the furum and is now going on to destroy a VW with his engineering "skills" :$
So plan is to prep a 126 synco box and I am stripping the engine completely so I can check it all out. I will the reassemble to my standards. Again I am going for some modest mods for the reassembly. Looking at fitting a lighter 500 flywheel, The Abarth fast road cam that I have, slightly sporty exhaust, 123 ignition and the modified head I have from the 795ccs engine so I can test it out. Thinking of running it in with a standard carb on a modified manifold spacer to get a good flow pattern. Then if all goes well I can then test out the twin choke Weber 30DIC to see how that goes :D :D
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(alledged to be fully reconditioned)
Ah ha, >:( I know the feeling.
Good luck.
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Sounds good Rusty 8)
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Before & after............ Oooooooooo some bits have dropped off :$
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Just as well I stripped the engine down as I reckon that it would have self destructed in about 10 mins of running going by the way it was assembled :o
All sorts of rubbish work but crazy in that the pistons & barrels are new. The main bearings & oil seals look new but the £20s worth of big end shells were very worn but fortunately not enough to damage the crankshaft. So just ordered new big end bearings & assembly will begin soon ;D
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Good morning Uncle Rusty. What's with the Horopito on the photos. Have you had any experiences with the Dellorto FZD carbs?
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Hi Allan, I started a file Horopito with some pictures from there now all my pictures download into that file so they get the same title. I do not mind as it brings back great memories when I see the name. Check out the sunshine in the pictures , it is our turn to have it now ;D
I have a Dellorto 38 FZD & manifold which came with the 795ccs Alquati engine which is slowly being worked on. However I am hoping to try out the Weber 30 DIC carb first which kind of brings us full circle as there are a couple of Weber 30 DIC carbs on 850 Sport Coupes in the Horopito yard.
Darrell from this forum is running a Dellorto 32 I believe that he has spoken highly of .
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Yes as Rusty says the Dellorto I have is very good.
It over-fuels a bit and my fuel economy is questionable when you run it hard but floorless acceloration and the thing I like the most is the manifold gets the carb away from the head (heat) so all the fuel doesn't evaporate out the carb.
I tried a bike carb and had pretty good results with that, just wasnt happy with the mounting it was on.
One thing comes-up over and over again is that no matter which option of carb you go for, the best set-up would be to have a specialist put the car on a dyno and jet it from there.
Make sure all the work you want to do to the engine is done first.
For example with mine, it is scheduled for dyno once I have completed what mods I intend doing.
So far fitted carb, sporty cam, sporty exhaust alloy sump, alloy extended rocker cover to increase internal air volume up top. Electronic ignition that works fitted. Electric fuel pump fitted and plated where pump was, to be used as breather later.
Breather to be sorted with catch tank. Oil cooler to be fitted. One to one belt drive toothed, alloy fan and possible re-work of venting of the rear bodywork.
Dynamic balancing to be done and lightened flywheel with increace to 700cc
although I have seen bigger piston kits, 700 seems to be the most durable.
This may all be scrapped as I am tinkering with a double overhead cam 4 valve head..who knows if it'll blow-up, nothing ventured nothing gained but then I'll be after a delly 40 twin choke :D
But then there are a few other ideas the conservatory plans have put pay to.. >:(
I like the idea of the SU as mixture across the range is adjustable via the nut that moves the jet in relation to the needle. Smallcox has an SU and to be honest, I think the SU would be cheaper and achieve just as good results and should fit strait onto the aftermarket casting for the Delly FZD. Ceramics are available from a website in australia to fit the SU's keeping them nice and cool 8) Spares readily available for them too ;)
There was a song in the 80's that went 'never ending sto-ory...la-la la la-la la la-la-la'
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Wasn't one of our members having a problem with the damper in the SU.
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Hi, Power hungry,
The SU is a good carb when you require an all round performer like good fuel economy and power but will not give as much power as your Dellorto although this will be at very top end. I hear you all mention the FZD manifold but believe this will only let you fit a 1 and a quarter SU to this and to be honest this is way to small even if you flow the carb. Go for a 1 and half inch (38mm) on a decent manifold (good luck with that one to) and you will have somthing near your Dellorto but economy will be possibly better. I get a real 51 mpg on mine :D
As I say the manifold is the problem, may have to make something ???
In the quest for power I have just sent my cyclinder head away for bigger valve seats to be fitted, 36mm and 30mm :)
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A blank Canvas :o
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8)now thats clenzzzzed. :o
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Blank canvas No6?
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No I think that Blank Canvas No 6 is still hanging in the Tate but I am starting to get some lines on my artwork ;D
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You're just showing off now Rusty.
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No I think that Blank Canvas No 6 is still hanging in the Tate but I am starting to get some lines on my artwork ;D
Hi Rusty,
That cam is nice... original... :$
is there any additional info on that camshaft saying, what type it is?
I also have an original Abarth-cam from 1969 with a similar shape and there is the number 079 on it.
Do you have more original parts? I always am looking for original parts and now am building an 595ccm-engine out of these... (but unfortunately not with an original crankcase)
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The cam was one of those dream buys on eBay that I came across by accident when searching for valves. The item had been badly listed and there was only one other bidder. The cam is unused up to now and was kept as a spare by a man who raced a 595 Abarth in the 1960's. Apart from Abarth on the casting there are no other marks apart from what looks like an ink print which could be an 8 , 3 or B. I had a bit of an e-mail dialogue with the seller and he told me that it was fast road / rally spec ;D
That was the good bit, now for what might have been a tragic ending. In our exchanges he told me that he was having to clear out a garage or unit. He had remarried and his wife had no interest / hated things to do with old motors. So he was going to have to get rid of more parts from his old Abarth racing days. He said that he had an engine with roller bearing crankshaft that would rev to 10,000 rpm also Nani cylinder heads and a selection of racing carbs were on the list. After several e-mails he stopped replying and I kept an eye on his eBay selling name and no other items were ever listed. Even if I did not get my grubby little mits on the parts I liked to think that they went to someone else but heard nothing on the grape vine.
I was left with the sinking feeling that 'er-in-doors got her way with a quick clear out :o
So no other abarth stuff I am afraid.
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I have some original Abarth parts. I rather prefer having a rotten Original part than a perfect replica.
so I have two oilpans, a Solex 34PBIC (with the correct rocker-cover) and a Solex C28IB-2 carb, some badges, valve springs, a head gasket, two original mufflers (also a "record monza") and some other parts... ;D
my actual project is building a perfect replica of a 595 SS engine. For that I have a 500D crankcase, widened up for 595ccm cylinders (unfortunately no Abarth-parts), a F-cylinder head with 34mm inlet valves, compression ration 10:1. All those fine parts will build a fine engine... 8)
If you like, I tell more about it...
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Got a bit distracted by other Fiaterama but now back on the case. I rejected the crankcase from the original "fully reconditioned" engine partly because some UNC bolts had been used on the ally casting :o and the repair job on the sheared off exhaust mounting studs was "interesting" to say the least.
I would guess that the guy who assembled the engine was unable to read the Haynes manual he had as little things like space the gaps in the piston rings around the piston seemed to escape him as they were nicely lined up. I also reckon that he probably thought that a torque wrench was a competitor for the iPhone.
So new big ends fitted , sump on eventually after discovering that the sump & oil pick up tube designs changed on the later engines. Cylinder head on, the push rod tubes are the solid type with deep seals at either end, so I wondered how the skimmed head would effect the seals but they all look OK :)
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Movin' on slowly , I want to run the engine in with a standard carb to see how things stand up etc.
The cylinder head inlet port is much modified to take the Twin Choke Weber or Dellorto carbs & manifols so to try and get a good flow pattern just modified the carb spacer to match the head :)
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It's been a while due to a couple of weeks away but finaly got the whole package lovingly assembled on my bench. Next problem was how to get the engine into my barrow so I could move it out to the car. Seems that Everest do more than double glazing as just as I was getting the car ready to take the new engine a couple of sales guys came round and were going through their patter while I was on the deck with my head stuck in the engine bay. It seems that the set script contained repetition of "so how can we help you?" Each time I replied "you can help me lift that engine into that barrow"
They took the hint after about 4 times of asking, gave up selling & got lifting :D
Had no idea how the mix of non-standard, new & modified parts would gel but once I got the timing close I was pleasantly surprised how smooth it ran and seemed to have a bit more go.
But true to form as I seem to have a habit of blowing something up within a week of a rebuild I managed to do just over 100 miles before the engine did not like starting and was blowing out smoke.
Seems that 60 mph in 3rd was not a good idea :$
So major engine strip down required :cry:
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to be continued
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If nothing else, the engine looks lovelly and shiny! Rusty 8)
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I think that I recorded the sad passing of this engine on another thread as it only lasted less than 1,000 miles and that included an engine partial strip down, new big end bearings and a good internal clean after about 500 miles. The powder coated rocker box cover had sandblast grit hidden up inside the internal parts which washed down and ruined this beautiful engine. I was so gutted that I just repaired and put the original stock motor back in and dumped the newly ruined one in my garage. :(
As I am now back on the rebuilding trail I have just finished the "post mortem" to see what I can salvage. Luckily the best bits seem to be unharmed especially the Abarth cam . The low compression and oil burning was down to the scoring of the bores (barrels now in for reboring) and the loss of oil pressure was down to the front (pulley end) main bearing being totaly knackered as well as the crank journal. So not good but not the end of the world ::)
Out of the ashes as they say ;D
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Final word on this one, the front main bearing looked like it had been coated with sugar. What had happened was that the grit had embedded into the soft white metal giving that effect and then just wore down the crank journal rather than the bearing. The only bit I had not looked at was the oil pump but checked it out yesterday and it is totaly shot along with the housing & timing chain cover. So that chapter is over and things are now emerging which I will report on ;D
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done a lot of work on rover v8's rule of thumb if already that deep in a rebuild always do oil pump and waterpump if you don't know its age/history would think oil pump on an aircooled critical to do 8)