P1000 Interesting Head Casting

[GPR1500SC]

If you get a chance, do some before and after timed runs and let us know.

Yes I will bought a G Tech just for that purpose.

 

[GPR1500SC]

Are you really going to do it??

No

Maybe if someone egged me on enough you never now.

Let see now 2 new coil assembly's and some machine work.

 

[1BadDart]

IMO I don't think you would feel any difference by adding the extra plug. More than likely there to help emissions. But you never know, put it on a chassis dyno before and after to see what it does, btw record the afr's on both pulls too.

 

[GPR1500SC]

The rough work done on one cylinder.

 

[snuffnwhisky]

The rough work done on one cylinder.

View attachment 32383

Awesome. Do you have any more photos of the stock ports? Have u thought about ordering a African Twin cam and see if there's a difference? While you got it apart can you measure the base circle and lift of the cam on intake and exhaust?

 

[GPR1500SC]

Awesome. Do you have any more photos of the stock ports? Have u thought about ordering a African Twin cam and see if there's a difference? While you got it apart can you measure the base circle and lift of the cam on intake and exhaust?

Yes I have thought about the African Twin cam but I am not going to pursue it simple because all cams have a sweet spot and I suspect the African Twin being a bike cam is going to be in the higher RPM range and I don't want to sacrifice any torque I am a little worried already that my exhaust porting might be hard on my torque numbers.
I am on the road so it will probably Wednesday be for I get you the lift numbers

 

[snuffnwhisky]

The rough work done on one cylinder.

View attachment 32383

One other thing, can you look in the header and see if those are cats or just shields where it bolts up to the head?

 

[moparornocar]

$7 a plug for your cummins? Huh thats a lot cheaper than the plugs in natural gas powered isl cummins at work. They are almost $60 a plug. Good thing there's only 6.

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Plugs in a diesel?

 

[1BadDart]

Yes I have thought about the African Twin cam but I am not going to pursue it simple because all cams have a sweet spot and I suspect the African Twin being a bike cam is going to be in the higher RPM range and I don't want to sacrifice any torque I am a little worried already that my exhaust porting might be hard on my torque numbers.
I am on the road so it will probably Wednesday be for I get you the lift numbers

Another thing is the Africa Twin is very light compared to our machines, so I'd be willing to guess the cam profile is way different and probably wouldn't work well in the p1k. If I were doing the head on my rig I'd probably just clean up the casting, make sure the intakes were port matched and smooth the bowls. Pretty much try to pick up the mid lift numbers and not worry about max flow at higher lift.

 

[snuffnwhisky]

One thing that doesn't make sense with the african twin's the redline is 8k just like the pioneer. Usually with more duration on the cam, it moves the peak hp up in the rpm range.

 

[1BadDart]

One thing that doesn't make sense with the african twin's the redline is 8k just like the pioneer. Usually with more duration on the cam, it moves the peak hp up in the rpm range.

Do you have the specs on the cams?

 

[snuffnwhisky]

Do you have the specs on the cams?

No but been thinking about ordering one to measure...

 

[GPR1500SC]

Another thing is the Africa Twin is very light compared to our machines, so I'd be willing to guess the cam profile is way different and probably wouldn't work well in the p1k. If I were doing the head on my rig I'd probably just clean up the casting, make sure the intakes were port matched and smooth the bowls. Pretty much try to pick up the mid lift numbers and not worry about max flow at higher lift.

All I intended to do when I started was to clean up the casting. LOL
BUT there was this little lip by the exhaust seat that looked restrictive and before I new it, it was GONE!
If you look real close at the first up right picture of the four ports you can see the lip on the exhaust port I am talking about I don't know if Honda put it there for a purpose or they where just sloppy other then that lip the ports look like they would flow good.

 

[snuffnwhisky]

All I intended to do when I started was to clean up the casting. LOL
BUT there was this little lip by the exhaust seat that looked restrictive and before I new it, it was GONE!
If you look real close at the first up right picture of the four ports you can see the lip on the exhaust port I am talking about I don't know if Honda put it there for a purpose or they where just sloppy other then that lip the ports look like they would flow good.

That's pretty common with an as cast port. The casting will be a little smaller and they machine for the valve seat. No problem blending that.

 

[Smitty335]

Yes I have thought about the African Twin cam but I am not going to pursue it simple because all cams have a sweet spot and I suspect the African Twin being a bike cam is going to be in the higher RPM range and I don't want to sacrifice any torque I am a little worried already that my exhaust porting might be hard on my torque numbers.
I am on the road so it will probably Wednesday be for I get you the lift numbers

View attachment 32384 View attachment 32385

Wonder whats causing the different colors on the exhaust ports? Is one running hotter?

 

[GPR1500SC]

Wonder whats causing the different colors on the exhaust ports? Is one running hotter?

Good catch Smitty you must be a true Hot Rodder one was running warmer

 

[Nic]

The only vehicles i have ever had to deal with that used 2 plugs per hole was a late 80s nissan pickup and an early 90s 4cylinder in a fast back stang. Both were junk imo

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I had a nissan pickup that went 542,000 on that 4cyl engine. It finally cracked a piston. Had another one that went 393,000. Neither of them had any work done to them other than clutches and transmissions. That Nissan 4cyl was in my opinion one of the best engines Nissan ever made.

 

[Smitty335]

Good catch Smitty you must be a true Hot Rodder one was running warmer

View attachment 32471

Yep, why?

 

[GPR1500SC]

Yep, why?

I bought it as a flood victim original owner did not dry it out and the motor sat full of water until I got it, it stuck a intake valve and the piston closed it tweaking it just enough it would not seal leaking compression back into the intake having never rode a Pioneer 1000 besides a dealer demo unit I used it for a while before doing a compression check and finding the rear cylinder down five pounds.
else I would have never pulled the head off just to polish the ports and put extra spark plugs in, but once it is off I could not help but do it.

 

[GPR1500SC]

Awesome. Do you have any more photos of the stock ports? Have u thought about ordering a African Twin cam and see if there's a difference? While you got it apart can you measure the base circle and lift of the cam on intake and exhaust?

I finally got around to getting these numbers posted
Intake base circle 32.14 lifted 39.47
Exhaust base circle 35.28 lifted 40.09