I'm in the process of replacing the old AQ110 petrol engine (negative earth)
in my boat with a Perkins Diesel.
Is it possible to retain my original Rev Counter (signal from contact
breaker), but pickup the signal from the Alternator instead and recalibrate
the instrument (I have an accurate hand held tacho to compare it with)?

Regards,
Brian
http://homepage.ntlworld.com/brunyard.

The Information contained in this E-Mail and any subsequent correspondence
is private and is intended solely for the intended recipient(s).
For those other than the recipient any disclosure, copying, distribution, or
any action taken or omitted to be taken in reliance on such information is
prohibited and may be unlawful.

What about using the Perkins tach? Ours works great....

On Fri, 14 Nov 2003 11:44:29 -0000, "Brian Runyard"
wrote:

I'm in the process of replacing the old AQ110 petrol engine (negative earth)
in my boat with a Perkins Diesel.
Is it possible to retain my original Rev Counter (signal from contact
breaker), but pickup the signal from the Alternator instead and recalibrate
the instrument (I have an accurate hand held tacho to compare it with)?

Regards,
Brian
http://homepage.ntlworld.com/brunyard.

The Information contained in this E-Mail and any subsequent correspondence
is private and is intended solely for the intended recipient(s).
For those other than the recipient any disclosure, copying, distribution, or
any action taken or omitted to be taken in reliance on such information is
prohibited and may be unlawful.





Larry W4CSC

"Very funny, Scotty! Now, BEAM ME MY CLOTHES! KIRK OUT!"

Larry

I don't have the Perkins tach, so before parting with hard earned cash I
wondered if I could modify what I've got.
The engine is a Perkins Prima 78hp Turbo, out of a car so I've got to spend
about £700 for the marinising kit.
Regards,
Brian

"Larry W4CSC" wrote in message
...
What about using the Perkins tach? Ours works great....

On Fri, 14 Nov 2003 11:44:29 -0000, "Brian Runyard"
wrote:

I'm in the process of replacing the old AQ110 petrol engine (negative
earth)
in my boat with a Perkins Diesel.
Is it possible to retain my original Rev Counter (signal from contact
breaker), but pickup the signal from the Alternator instead and
recalibrate
the instrument (I have an accurate hand held tacho to compare it with)?

Regards,
Brian
http://homepage.ntlworld.com/brunyard.

The Information contained in this E-Mail and any subsequent
correspondence
is private and is intended solely for the intended recipient(s).
For those other than the recipient any disclosure, copying, distribution,
or
any action taken or omitted to be taken in reliance on such information
is
prohibited and may be unlawful.





Larry W4CSC

"Very funny, Scotty! Now, BEAM ME MY CLOTHES! KIRK OUT!"

On Fri, 14 Nov 2003 19:29:08 -0000, "Brian Runyard"
wrote:

Larry

I don't have the Perkins tach, so before parting with hard earned cash I
wondered if I could modify what I've got.
The engine is a Perkins Prima 78hp Turbo, out of a car so I've got to spend
about £700 for the marinising kit.
Regards,
Brian

Ah, sorry. I got a clearer picture of your problem, now. We just
paid $US1200 for a 4-108 with 700 hours on it from a guy who went
Yanmar right from this newsgroup. The engine has been delved into and
is in fine condition, especially for $US1200! It will soon replace
the 4-108 in Lionheart which has about 7000 hours on it. The new
engine has a nicer panel than the old one, so it will all be replaced,
too, getting rid of the car oil guage, etc., for the Perkins that
matches.

I don't see where you'd get the pulses from a diesel the old ignition
system gave you for that tach. If the old engine were a 4-stroke,
4-cylinder, you got 2 pulses per revolution. An alternator is very
high frequency in comparison so I don't think that will work. There
might be a way to get a magnetic pickup to pulse the tach from a
couple of magnets on the flywheel, but I'm not sure how I'd trust a
jury rig on something as important as the main engine, even on a
sailboat.



Larry W4CSC

"Very funny, Scotty! Now, BEAM ME MY CLOTHES! KIRK OUT!"

asap supplies in the uk sell Faria rev counters that use alternator
sensing,( I have two on twin diesels)
www.asap-supplies.com
good luck Brian


"Brian Runyard" wrote in message
...
I'm in the process of replacing the old AQ110 petrol engine (negative
earth)
in my boat with a Perkins Diesel.
Is it possible to retain my original Rev Counter (signal from contact
breaker), but pickup the signal from the Alternator instead and
recalibrate
the instrument (I have an accurate hand held tacho to compare it with)?

Regards,
Brian
http://homepage.ntlworld.com/brunyard.

The Information contained in this E-Mail and any subsequent correspondence
is private and is intended solely for the intended recipient(s).
For those other than the recipient any disclosure, copying, distribution,
or
any action taken or omitted to be taken in reliance on such information
is
prohibited and may be unlawful.

Larry

The engine plus a second for spares only cost 60UKP.
I experimented at the weekend, and have solved my problem.
1. Built a circuit that uses an optical sensor
2. Removed the circuit board from inside the tacho, so it's just a moving
coil meter.
3. Put 2 white blobs on the flywheel.
4. Calibrated the circuit.
Works wonderful.

Regards,
Brian
http://homepage.ntlworld.com/brunyard


"Larry W4CSC" wrote in message
...
On Fri, 14 Nov 2003 19:29:08 -0000, "Brian Runyard"
wrote:

Larry

I don't have the Perkins tach, so before parting with hard earned cash I
wondered if I could modify what I've got.
The engine is a Perkins Prima 78hp Turbo, out of a car so I've got to
spend
about £700 for the marinising kit.
Regards,
Brian

Ah, sorry. I got a clearer picture of your problem, now. We just
paid $US1200 for a 4-108 with 700 hours on it from a guy who went
Yanmar right from this newsgroup. The engine has been delved into and
is in fine condition, especially for $US1200! It will soon replace
the 4-108 in Lionheart which has about 7000 hours on it. The new
engine has a nicer panel than the old one, so it will all be replaced,
too, getting rid of the car oil guage, etc., for the Perkins that
matches.

I don't see where you'd get the pulses from a diesel the old ignition
system gave you for that tach. If the old engine were a 4-stroke,
4-cylinder, you got 2 pulses per revolution. An alternator is very
high frequency in comparison so I don't think that will work. There
might be a way to get a magnetic pickup to pulse the tach from a
couple of magnets on the flywheel, but I'm not sure how I'd trust a
jury rig on something as important as the main engine, even on a
sailboat.



Larry W4CSC

"Very funny, Scotty! Now, BEAM ME MY CLOTHES! KIRK OUT!"

Great! Glad you solved it. Hmm.....might be a market for it.....(c;

On Mon, 17 Nov 2003 16:16:35 -0000, "Brian Runyard"
wrote:

Larry

The engine plus a second for spares only cost 60UKP.
I experimented at the weekend, and have solved my problem.
1. Built a circuit that uses an optical sensor
2. Removed the circuit board from inside the tacho, so it's just a moving
coil meter.
3. Put 2 white blobs on the flywheel.
4. Calibrated the circuit.
Works wonderful.

Regards,
Brian
http://homepage.ntlworld.com/brunyard


"Larry W4CSC" wrote in message
...
On Fri, 14 Nov 2003 19:29:08 -0000, "Brian Runyard"
wrote:

Larry

I don't have the Perkins tach, so before parting with hard earned cash I
wondered if I could modify what I've got.
The engine is a Perkins Prima 78hp Turbo, out of a car so I've got to
spend
about £700 for the marinising kit.
Regards,
Brian

Ah, sorry. I got a clearer picture of your problem, now. We just
paid $US1200 for a 4-108 with 700 hours on it from a guy who went
Yanmar right from this newsgroup. The engine has been delved into and
is in fine condition, especially for $US1200! It will soon replace
the 4-108 in Lionheart which has about 7000 hours on it. The new
engine has a nicer panel than the old one, so it will all be replaced,
too, getting rid of the car oil guage, etc., for the Perkins that
matches.

I don't see where you'd get the pulses from a diesel the old ignition
system gave you for that tach. If the old engine were a 4-stroke,
4-cylinder, you got 2 pulses per revolution. An alternator is very
high frequency in comparison so I don't think that will work. There
might be a way to get a magnetic pickup to pulse the tach from a
couple of magnets on the flywheel, but I'm not sure how I'd trust a
jury rig on something as important as the main engine, even on a
sailboat.



Larry W4CSC

"Very funny, Scotty! Now, BEAM ME MY CLOTHES! KIRK OUT!"





Larry W4CSC

"Very funny, Scotty! Now, BEAM ME MY CLOTHES! KIRK OUT!"

Yeah, until it gets oil or grease or something on it!
BruceM


"Larry W4CSC" wrote in message
...
Great! Glad you solved it. Hmm.....might be a market for it.....(c;

On Mon, 17 Nov 2003 16:16:35 -0000, "Brian Runyard"
wrote:

Larry

The engine plus a second for spares only cost 60UKP.
I experimented at the weekend, and have solved my problem.
1. Built a circuit that uses an optical sensor
2. Removed the circuit board from inside the tacho, so it's just a moving
coil meter.
3. Put 2 white blobs on the flywheel.
4. Calibrated the circuit.
Works wonderful.

Regards,
Brian
http://homepage.ntlworld.com/brunyard


"Larry W4CSC" wrote in message
...
On Fri, 14 Nov 2003 19:29:08 -0000, "Brian Runyard"
wrote:

Larry

I don't have the Perkins tach, so before parting with hard earned cash
I
wondered if I could modify what I've got.
The engine is a Perkins Prima 78hp Turbo, out of a car so I've got to
spend
about £700 for the marinising kit.
Regards,
Brian

Ah, sorry. I got a clearer picture of your problem, now. We just
paid $US1200 for a 4-108 with 700 hours on it from a guy who went
Yanmar right from this newsgroup. The engine has been delved into and
is in fine condition, especially for $US1200! It will soon replace
the 4-108 in Lionheart which has about 7000 hours on it. The new
engine has a nicer panel than the old one, so it will all be replaced,
too, getting rid of the car oil guage, etc., for the Perkins that
matches.

I don't see where you'd get the pulses from a diesel the old ignition
system gave you for that tach. If the old engine were a 4-stroke,
4-cylinder, you got 2 pulses per revolution. An alternator is very
high frequency in comparison so I don't think that will work. There
might be a way to get a magnetic pickup to pulse the tach from a
couple of magnets on the flywheel, but I'm not sure how I'd trust a
jury rig on something as important as the main engine, even on a
sailboat.



Larry W4CSC

"Very funny, Scotty! Now, BEAM ME MY CLOTHES! KIRK OUT!"





Larry W4CSC

"Very funny, Scotty! Now, BEAM ME MY CLOTHES! KIRK OUT!"