32 replies to this topic

[CraigyBoy]

topic started

http://www.theminifo...showtopic=81280

[tuktuk]

the true extent of the damage

[miniboo]

ouch

[Jammy]

In my very amateur opinion, thats going to need welding.

[tuktuk]

looks like itl be going in the scrap pile

[miniboo]

get it wleded and it might be fine.

[sovenmini]

cant see why you cant weld that up. if it is done proply it should be fine.

[tuktuk]

if its blown once, surely it will blow again.

plus how much is it going to cost for that work ? il be better off getting a new head !

[miniboo]

true, might be best to scrap it and start again with a new head.

[Sprocket]

I would only ever trust a proper cast iron repair on that, which means a complete re machine of every surface, and not worth it unless it something VERY rare or exotic. Trust me, it has to be rare for it to be worthwhile, I have enquired

http://www.slinden.co.uk/

Although people have welded cast iron, its not a weld that carries much strength, and where there is mechanical stress and heat, i doubt it would survive very long.


One option could bee to fit a steel valve seat in the inlet side first then machine for a steel valve seat on the exhaust, but when there isnt much between the valves to start, its goinng to bee very difficult.

I think you are right that the best option is to start again.

Remember, no need for the biggest valves you can get to sit side by side

[minorconfusion]

can surely install valve seats, reduce the size of the valve's and weld in everywhere else?

[Sammy D]

Those valves are just too big!

[fatmini]

u only live once !!! LOL good lad !!!!sorry for ur loss !!!


how come the bore has a mirror finish ?

[ginigwunkle]

no offence but looking at your 'first engine run' video in your project thread im not suppruised that its cracked, sounds a little over 2/3000rpm that your revving it at and up and down revs cant be too great for the whole engine.

for those valves you need to let it warm WELL before you drive off!

get another head and treat it like that and it wont be long before you got two scrappers!

treat it well and wil last you years!

[baker_boy]

if i wer u id start again, get another head port it, stick in some slightly bigger valves, i reckon these valves are overkill. was never really gonna last long to be fair, theres like no gap between the valves! hope u get it sorted anyway. keep us updated as what you do.