Viterbo

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About Viterbo

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  1. Viterbo

    Worked 5K problems on 1st start

    I was wrong about the 15 degrees, I was cheated by the new cam profile. The TDC is accurate on the 0 mark. After some time messing with the timing I think the problem is the carb is too small and can't delivery enough AIR to the system. On low rpms (below 1600rpms) it tries to suck but gas comes out of the jet in bubbles and I think it floods due to insufficient air.
  2. Viterbo

    Worked 5K problems on 1st start

    Full lift was at 104,5º with the vernier pulley untouched so I advanced it a bit to reach the 103º specified by the manufacturer. The issue is the car doesn't idle, at least below 1800rpms and with the help of the butterfly being a bit opened... In that last video you can see when I enter the car the idle drops a bit and the engine starts to miss a lot, I had the choke pulled and closed it a bit. Its enough for the engine to shut down...
  3. Viterbo

    Worked 5K problems on 1st start

    This one, it's possible to see the marked link on the dot on the crank and the other link on the cam pulley oposite to the pin in the center.
  4. Viterbo

    Worked 5K problems on 1st start

    Yes. Dots oposite to each other, then with the chain I stretched it making a rectangle shape with the links touching each other having a single link on each end (oposite to each other) and I marked them to ensure I place them on the dots on the pulleys. I think it's a pretty simple process leaving no room for error. No special instructions on the camshaft, just the degrees to have it dialed in (103º at full lift). I maxed out the advanced on the dizzy adjustment and had no time to advance another tooth. Tomorrow I'm going to do it and see how it reacts to more timing.
  5. Viterbo

    Worked 5K problems on 1st start

    Advanced the dizzy and got a bit better but it's still like this:
  6. Viterbo

    Worked 5K problems on 1st start

    Pulley is the same brand as the camshaft: Kent Cams UK The engine was running in std form before disassembly and everything from it was used so no swapped parts that could lead to error. Marks were aligned, the timing on these engines seems to be dumb proof. The pulley only has one single hole to insert in the camshaft pin so no chance to error there too... I'm going to see if the mark on the belt pulley doesn't match the new TDC, if it doesn't my timing must be around 15 degrees retarded which might well be a tooth out on the dizzy
  7. Viterbo

    Worked 5K problems on 1st start

    It goes till 2800 that was the maximum it went. It misses roughly the engine shakes. I'm using standard points denso Dizzy. I think there's a possibility the timing is out, I set it according to the belt pulley mark which for some reason seems to be around 15 degrees of (piston is at TDC at 15 degrees btdc on the timing cover) and it was at 0 before. But the chain was well fitted I can ensure that
  8. Viterbo

    Worked 5K problems on 1st start

    Hi Banjo, here goes some answers: 1- Engine was assembled by me 2 and 3 - Yes, degree wheel was used, I found the true TDC and then set the cam timing with a duplex adjustable pulley 4- I don't think it's starving because in the video it's me who's accelerating and the engine responds to my input very easily 5- Engine is on the car with everything attached to it ready to go for a spin 6- I do have a timing light and that's something I want to check but I need the engine at least to idle which he doesn't do atm 7- it's easier to rotate the engine without the plugs but seems pretty tight 8- only factory dash oil pressure light 9- As said on question 4 it's me who's accelerating, because I was running in the cam revving the engine between 2000 and 2500rpms, it responds rather well to the input despite the roughness behaviour
  9. On the past months I've been building a worked 5K with the following specs: +0,5mm oversized pistons 2mm oversized valves 290º camshaft with vernier pulley set to max lift at 103º as indicated by the technical sheet 5K/3F solid lifters with 4K adjustable gear Ported head to match the 1 piece gasket Block and head machined, around 10,5:1 compression ratio. Lightened flywheel and crankshaft In order to have a smooth 1st start, particularly in order to run in the camshaft I used the standard dizzy and carb with the main jet of the carb drilled from 0.96mm to 1.1mm. This is how the engine ran: Audio isn't the best but looks like it's working on 3 cylinders or something like that, that's too many new variables for me to have a clue on what can be wrong. The car worked around 15 minutes do ensure proper run in of the cam, varying between 2000 and 2500 rpms and it never ran better than this. After that, I took my foot of the gas to see if it would idle and it shut down. The carb was set as it was removed from the engine before the disassembly (apart from the drilled jet). The car is not giving massive pops through the exhaust... Plugs left the engine dry and with a brownish color. While the engine was running I tried advancing or retarding the dizzy but apart from differences on throttle response it didn't change the roughness... EDIT: is running on 95RON
  10. Viterbo

    Distributorless 5K Engine

    Wasn't aware of slack on the chain contributing to timing variations. Won't you be happy with a wasted spark system?
  11. Viterbo

    Distributorless 5K Engine

    Banjo search for Speeduino. It's a fully programmable ECU developed in Arduino that can cost half of a Megasquirt price. I've spent some time thinking on a distributorless ignition but what to do with the oil pump? It'll still need the shaft in there for that. And that could be used as camshaft signal for the independent ignition.
  12. Viterbo

    Enlarge head ports

    Yes I know I can make gaskets. Not having the template to do it is the issue here... As soon as I get that one piece gasket I'm gonna create a template of it so I can get it done in the future.
  13. Viterbo

    Enlarge head ports

    Finding that gasket is going to be a nightmare. The one on eBay with shipping costs more than 30€. Already PMd oldskewltoy on porting tips, and altezzaclub to see if sending me a gasket is "doable"
  14. Viterbo

    Enlarge head ports

    I have a twin squish head that I want to apply on a worked 5K and I want to enlarge the intake and exhaust ports. I know that the one piece gasket is very good to match but I can't source one in Europe (at least at a fair price). So I would like to ask for tips on the sizes of the ports. I was told the one piece gasket is 33x30 on the intake and 27x22 on the exhaust. The intake seems fine but the exhaust sizes are almost the same as the stock head... What's the safest sizes I can go? Thanks
  15. A Finnish company sells 83mm Wiseco pistons so I guess a 5K can take it? I also don't get it how does the 4K head fit on a 5K with this having so much more bore available...