02GF74
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| posted on 8/5/06 at 08:55 AM |
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crossflow stage 2 head?
think I've got my pesky little hands on a crossflow stage 2 head - ported, bigger diameter vavles ... just wondering shold I replace thge one on
my 1300?
Dunno the history of the engine but I know the inlet ports looked untouched so presumably internals are standard.
I am running twin delO 40s - it there much benefit in fitting the head (don;t won't to be creating extra work but it should be more than a
days).
Then should I thihnk about putting in a sportier cam or not bothjer - that is more time consuming but if I have to drain the coolant, I might as well
do that at the same time.
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Marcus
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| posted on 8/5/06 at 09:13 AM |
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Changing the cam in a crossflow means engine out.
Getting the cam out is dead easy, but, 1 by 1, the followers drop into the sump!
Engine has to be upside down to refit (unless you're a contortionist, and can reach up from the inside sump!)
A stage 2 head usually has standard sized 1600 GT valves (39.5 / 32) and is likely to have been polished or mildly ported. As it's a steel head,
any serious porting takes hours and many aren't all they're cracked up to be.
Saying all that, if it's going on a 1300, the increase in valve size will be worth it.
Marcus
Marcus
Because kits are for girls!!
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02GF74
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| posted on 8/5/06 at 09:23 AM |
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valves apparently are 40/34 
so followers do not drop in from the top ... hmmn, may give the cma change a miss though.
One more Q; I know my block has been skimmed plus the head has a bit taken off; so I may run into problem with fuel re: too high a CR or maybe
valve/piston contact - are both of those likely and can I tell if this will be a problem before fitting (I suspect the answer is no )???
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MikeRJ
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| posted on 8/5/06 at 09:27 AM |
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The crossflow has no combustion chamber in the head so you cannot really change CR by bolting another head on. Likewise, with the same cam and
rockers, valve lift will be exactly as before.
Adding a ported head is likely to need some carb tweakage to correct the mixture, and a sportier cam will definately require rejetting to gain any
advantage.
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Marcus
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| posted on 8/5/06 at 09:29 AM |
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Depends on the cam you have fitted. You can get away with something like 10mm valve lift with no mods to pistons - takes care of 285 / 234 / BCF2 cam.
CR shouldn't be a problem. Lots of folk use 1300 pistons in 1600 engines to increase CR (smaller bowl in crown). If you're worried, dummy
build the engine and turn over by hand. Any contact will be obvious.
Marcus
Marcus
Because kits are for girls!!
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