Långbultar
Postat: tor nov 19, 2009 4:05 pm
funderar på att utrusta blocket nu när det endå är nere att köpa långbult.. vad kostar bultarna nån som vet/kommer ihåg?
är det lönt att köpa i england?
är det lönt att köpa i england?

Why is long studding bad?
Interesting post! D Amazing how old wives tales keep on going!
I personally do NOT recommend long studding.
This does not mean I never do long stud, as several of my engines I have built over the years, I have long studded.
Bore distortion with using head bolts is total nonsence as my blocks are all torque bored.
Long studding the 200 block is pointless because the centre pair of bolts screw into full height internal pillars meaning long studding involves machining down the centre of the full height of the internal pillar. This weakens the block! TOTALLY POINTLESS!
The std head bolts also give a more reliable and superior clamp than the usual mountune style studs. This I have extensively tested (using proper engineering tests) and hence is not just "my opinion" but a FACT I have proven to myself!
In addition a long studded block often suffers with deck face distortion. This is nearly always proved when I have to machine the deck face of a used long studded block. It nearly always has a low section running length ways centrally down the block, indicating the block walls are rising relative to the main bearing saddles. This causes low spots and loss of clamping bewteen cylinders where the head gasket is thinnest!! NOT GOOD!
The only issue with using std head bolts is when encountering cracking around the 2nd or 4th pair of head studs. In this case long studding is necessary in order to save the block.
My own engine and 90% of customer engines all use std head bolts, but of course a few of my engines do use long studs for various reasons!
Suffice to say if you call me up and ask do I recommend them, you will be told I don't recommend it, however on occasions I do long stud!
Hope that clarifies that one!
__________________
Best regards,
Karl Norris
Karl Norris har inget med Norris Design att göra.RaZoR skrev:Detta fick mig att komma ihåg vad Karl Norris (Norris Design) skrev om långbultar för en tid sen.
Jaha det är så det ligger till blandade ihop dom två, mitt fel då. Tycker ändå att det ligger något i det han säger. Sen beror det på hur mycket cylindertryck man har också. Alla tävlingsmotorer behöver inte långbult.chip skrev:Karl Norris har inget med Norris Design att göra.
Han som har Norris design (evo trimmare)heter simon och kör en grön kortad evo 9:a.
Karl har många egna ideer om allt och bygger inte de värsta cosworth motorerna. Alla tävlingsmotorer är lång bultade, säkert av en anledning...