Tom, it's a good idea to increase your advanced timing an extra 3-4 degrees for some extra low end torque when fitting 1.5s. Also recurving the dizzy helps! Can I ask what your stock tappet clearance was and what is the engine from? Cheer's & beer's mate.....
I do not know what camshaft Tom has, but I have never seen actually dyno/rolling road proof that 1.5 rockers lose power downlow on stock camshaft, not even on a camshaft like a 266. I believe this has to do with the low overlap of these camshafts as it is overlap that increases powerloss on low revs and the 1.5s do not increase overlap enough to cause an issue. But this is just my personal view on this subject.
@@GTE_Channel Some suggest you lose torque below 3000 rpm and gain the odd BHP only at the top end. 4 degrees advance when timing the cam with hi lift rockers makes a big difference... as most drive more at lower rpm on the street for that stop light to stop light suck your ass to the seat sensation, then you will top rpm on the track.
@@paulhotson5820 Hi Paul, this is what I mean, people do say this but I have never seen any dyno data to prove this is correct on stock cams. Cams that allready run lumpy on idle will definitely lose power down low as they will lose even more vacuum. I think people generalize this to much. I agree with you on the ignition advance, I feel any non standaard Mini engine will benefit from a re-curved ignition to give more advance in the lower revs.
Hey guys, sorry for the late response. I hadn’t adjusted my ignition timing as yet, but definitely will next time I tune her. My car came out standard with an 1100 and has a 266 camshaft fitted. I did adjust the tappet clearance to 15 thou as per The GTE Channel asked. I did notice a power increase, not neck snapping, but enough to know there is a difference on takeoff and revving. As I haven’t had my car put on a dyno, I can’t confirm how much extra power it makes. All I know is my right foot is quite often planted to the floor, so much so that I’ve almost had to fit another floor pan to her
@@paulhotson5820 also being forged it’s stronger than the standard steel ones. Added horsepower and strength if you’re chasing bigger power numbers. This made a difference, not neck snapping but noticeable. The longer the lift duration, the more air and fuel inside the cylinder = bigger bang!
@@paulhotson5820 sure did mate. I think with the camshaft it has in it, I was setting them to around 12 thou, but given the extra leverage, I did increase it to 15 thou. Thanks for asking as it’s good to know for future reference for anyone doing the same job
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This looks like a great upgrade, well done!
Tom, it's a good idea to increase your advanced timing an extra 3-4 degrees for some extra low end torque when fitting 1.5s.
Also recurving the dizzy helps!
Can I ask what your stock tappet clearance was and what is the engine from?
Cheer's & beer's mate.....
I do not know what camshaft Tom has, but I have never seen actually dyno/rolling road proof that 1.5 rockers lose power downlow on stock camshaft, not even on a camshaft like a 266.
I believe this has to do with the low overlap of these camshafts as it is overlap that increases powerloss on low revs and the 1.5s do not increase overlap enough to cause an issue.
But this is just my personal view on this subject.
@@GTE_Channel Some suggest you lose torque below 3000 rpm and gain the odd BHP only at the top end.
4 degrees advance when timing the cam with hi lift rockers makes a big difference... as most drive more at lower rpm on the street for that stop light to stop light suck your ass to the seat sensation, then you will top rpm on the track.
@@paulhotson5820 Hi Paul, this is what I mean, people do say this but I have never seen any dyno data to prove this is correct on stock cams. Cams that allready run lumpy on idle will definitely lose power down low as they will lose even more vacuum.
I think people generalize this to much.
I agree with you on the ignition advance, I feel any non standaard Mini engine will benefit from a re-curved ignition to give more advance in the lower revs.
Hey guys, sorry for the late response. I hadn’t adjusted my ignition timing as yet, but definitely will next time I tune her.
My car came out standard with an 1100 and has a 266 camshaft fitted. I did adjust the tappet clearance to 15 thou as per The GTE Channel asked.
I did notice a power increase, not neck snapping, but enough to know there is a difference on takeoff and revving. As I haven’t had my car put on a dyno, I can’t confirm how much extra power it makes. All I know is my right foot is quite often planted to the floor, so much so that I’ve almost had to fit another floor pan to her
What is the benefit of forged rockers?
Just a bit more lift on the valves equals 3 to 5 more horses!
@@paulhotson5820 also being forged it’s stronger than the standard steel ones. Added horsepower and strength if you’re chasing bigger power numbers. This made a difference, not neck snapping but noticeable. The longer the lift duration, the more air and fuel inside the cylinder = bigger bang!
@@Tomostuneups Did you set tappets to 15 thou?
@@paulhotson5820 sure did mate. I think with the camshaft it has in it, I was setting them to around 12 thou, but given the extra leverage, I did increase it to 15 thou. Thanks for asking as it’s good to know for future reference for anyone doing the same job