hi all....

i am owner of datsun B310 from asia

and i just got my car back after transplant
(original A12 to A15)

but the problem is that,
i hardly feel the power improvement..
it is just slightly better then the original A12,

why is it like this?
is it setting problem?
or the A15 really feels just slightly better then A12?

hope someone who use the engine before can tell me....


thanks

the power difference is really noticeable when u have a good sized exhaust system from the engine to back and a decent carby.

I agree with these comments. My 1200 has an A15 with extractors and a bigger exhaust and it is noticably quicker than with an A12, even though I only have the standard carby. A weber or similar would make it go even harder.

the diffrence should be VERY noticable straight off i would think

did the a12 have work done to it? or are they both as from factory?

sure mods to carb and exhaust make an a15 even better but the diffrence should still be noticable without these mods

Have a look at simple things like.
Is the timing set properly & is it getting full advance the timing mark should move to about 20 degrees with the vac advance disconected & vac hose blocked.
The exhaust could be restricting it.
If the exhaust is old it could be a bit blocked.
Have they used an A12 carby on the A15?
Also is the vac advance conected if it is check that it is working buy checking if there is vac getting to it then take off the distributor cap conect a peice of hose to it & suck on it you will see the base plate in the distributor move.These are some simple thing to check first before spending money.
Also if it was a second hand motor do a compression test replace the spark plugs if they wearnt already changed whenyou did the job. And it wouldnt hurt to check the tappets.