exhaust ports you can polish, inlet are best left ruff to create swirl
Tuning manifold port and polish?
- Thread starter mozart
- Start date
Currently reading:
Tuning manifold port and polish?
But what's the point?
^^ this. Will only be shiny for 10 seconds after the engine is started.
run on v power
Hi
It is simpler just fitting the high lift cam, grinding bits just cause you have a grinder, is risky, read all the posts, on this thread again. The cam gives more torque low down the little car is easier to drive.
I'd still tell the ins company, and if you still have spots, you still need to stop...
Noel
It is simpler just fitting the high lift cam, grinding bits just cause you have a grinder, is risky, read all the posts, on this thread again. The cam gives more torque low down the little car is easier to drive.
I'd still tell the ins company, and if you still have spots, you still need to stop...
Noel
i do, mine is not clean.. Your not wrong that it will improve flow but kinda pointless in anything but a car thats is regularly dismantled and cleaned etc eg. drag car. Is really kinda pointless for a daily/road car if you ask me
I don't think there are any pics. You want something like 1/8" step preferably at the bottom.
Smaller.
Step at bottom. Doesn't really matter how you acheive it.
Get the A Graham Bell book. Lots of ideas, which -- although you'll have to do your own testing re. their applicability on the FIRE engine -- is a lot better than poking about in the dark.
All the best tuners/engine builders seem to read a lot.
Get the A Graham Bell book. Lots of ideas, which -- although you'll have to do your own testing re. their applicability on the FIRE engine -- is a lot better than poking about in the dark.
All the best tuners/engine builders seem to read a lot.
Can't post pics at the moment.
Port match only.
Port match only.
Look at it another way. Some folk say don't portmatch the exhausts -- just remove any obvious casting flaws. This is the easiest and safest option.
Others say, portmatch only at the top (where gas flow is the highest). Depending on the match with the exhaust manifold, this may be leave a step at the bottom. This is a good thing.
Dave Vizard did development on Pinto heads which led him to come up with an anti flow reversion insert which fitted between the exhaust manifold and the exhaust ports. This was for a highlt developed race engine.
The supersprint 8v manifolds only match the exhaust ports, more or less, at top and bottom -- they use round tube, where the ports are oval. It seems to work.
You get the idea?
No finish finer than 80 grit is required. Stay away from the valve guides and valve seats. Get all the grit out. Finally, recut the valves, skim the head, do the shims.
None of this is simple and there are no guarantees. Read. Read. Read. Anything by Corky Bell, A Graham Bell, Dave Walker or Guy Croft (not necessarily in that order) is worth reading.
Others say, portmatch only at the top (where gas flow is the highest). Depending on the match with the exhaust manifold, this may be leave a step at the bottom. This is a good thing.
Dave Vizard did development on Pinto heads which led him to come up with an anti flow reversion insert which fitted between the exhaust manifold and the exhaust ports. This was for a highlt developed race engine.
The supersprint 8v manifolds only match the exhaust ports, more or less, at top and bottom -- they use round tube, where the ports are oval. It seems to work.
You get the idea?
No finish finer than 80 grit is required. Stay away from the valve guides and valve seats. Get all the grit out. Finally, recut the valves, skim the head, do the shims.
None of this is simple and there are no guarantees. Read. Read. Read. Anything by Corky Bell, A Graham Bell, Dave Walker or Guy Croft (not necessarily in that order) is worth reading.
