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ronald_loulan
Re: Modded A15 problem
#15
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Retuned my engine d...
The ignition timing were too much when i plug in the vacuum...
Static 12 deg but wif vacuum it goes bout 25 deg...
Adjust it to 10 deg(static) n wif vacuum 15 deg...
After the adjustment i found tat the nosedive prob occur under 2000rpm...(previous was 2500rpm)
Confused....

Posted on: 2009/9/4 4:20
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B110 1972 Modded A15
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ronald_loulan
Re: Modded A15 problem
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Thank guys....
U guys really helped me....

Posted on: 2009/9/2 8:48
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ddgonzal
Re: Modded A15 problem
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Quote:
single spring good enough or i must use the double 1???

Quote:
Then engine cant rev past 6k rpm


A15 valve springs are only good for a little over 6000 RPM. For higher RPM, Nissan Competition sold dual springs. The lighter A12 valves could go about 6400 with single springs. But the A15 has larger valves. And if yours are worn from age and use, they might not even rev to spec.

Quote:

Any other engine's single valve spring(heavier) tat i can use??
Yes, but your cam will wear out faster. Some use Austin Mini competition springs on the Nissan A Engine.

Dual valve springs are the best.

Posted on: 2009/9/1 19:16
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ronald_loulan
Re: Modded A15 problem
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I recall tat it was from ae86....
But after i install it to the std b310 suspension,the front looks high...
So i adjust it down to the max but still looks high...
Change the spring to stiffer n lower 1...
Then the absorber was like no play after installing 1 inch bump stop....

Posted on: 2009/9/1 15:04
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ROConnor
Re: Modded A15 problem
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I think they may be silvia strut tops, hav seen them used beffor.

Posted on: 2009/9/1 14:18
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LittleFireyOne
Re: Modded A15 problem
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Quote:
The strut tops were so rare in Malaysia... Tats the 1st 1 i saw when i bought it...


Too right, inverted monotube shock absorbers!! that's the sort of good gear you would find on a rally car or circuit car.

Posted on: 2009/9/1 14:06
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superbin
Re: Modded A15 problem
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Rather go double on any performance 8valve a 16valve head is another story there the valves are about half the weight and you can get away with one spring. On the 8 valve the valves just become to heavy. Anyway that the way I figure it to be.

Posted on: 2009/8/31 20:37
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ronald_loulan
Re: Modded A15 problem
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Is single spring good enough or i must use the double 1???
Any other engine's single valve spring(heavier) tat i can use??

Posted on: 2009/8/31 11:47
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ROConnor
Re: Modded A15 problem
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you'l need heavyer spings to make the best of your cam otherwhise its a bit of a waist. for much over the 6000 rpm mark you will need doubles.. allthough I hav heard of some racers who arent allowed to use doubles useing Haley davidson springs and allso buick V6 springs.

Posted on: 2009/8/31 8:16
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ronald_loulan
Re: Modded A15 problem
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Im thinking of stock spring from other engine like mayb L16 or etc??
I scare those hard spring will wear off my regrind cam...(not sure bout tat)
Low budget spring i mean...
Thanks...

Posted on: 2009/8/31 7:57
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