where to get irons lapped?
05-30-05, 12:31 AM
#1
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where to get irons lapped?
ok...i need to have my irons lapped...what i was wondering is where is the nearest (washington) place and cheapest place i could get them lapped...
05-30-05, 10:49 AM
#4
Airflow is my life
Originally Posted by jays83gsl
Eh, do it yourself. Just use a drill with a sander attatchment.
Are you mad?How far is Pineapple racing or Atkins to you? They can do it.
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05-30-05, 05:53 PM
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ugh...so who is the cheapest?
also...when is it absolutely necessary to lap them??? my irons seemed like they were pretty damned decent...only 1 small spot where you could feel a small bit of wear...and that is on the apex seal path across from the ports...i really dont wanna have to spend about $300 to have my irons lapped...
also...when is it absolutely necessary to lap them??? my irons seemed like they were pretty damned decent...only 1 small spot where you could feel a small bit of wear...and that is on the apex seal path across from the ports...i really dont wanna have to spend about $300 to have my irons lapped...
05-30-05, 11:34 PM
#12
Similar thread ten days ago: https://www.rx7club.com/1st-generation-specific-1979-1985-18/lapping-housings-427388/
05-31-05, 03:17 AM
#14
I wondered where I could get them done here in Houston and found a place by running a search in google for lapping in Houston. (You might even get a lap dance site or 2 in your search!!!) They charge $25 per side and as it turns out have done several rotaries in the past. That's pretty cool!
05-31-05, 03:19 AM
#15
Here you go. First search attempt in Google. Precision Engineering Inc. in Seattle. Give them a call.
http://www.precisionengineeringinc.c...illlapping.htm
http://www.precisionengineeringinc.c...illlapping.htm
05-31-05, 09:06 AM
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Originally Posted by jays83gsl
Okay, don't use the power sander. . . . do it by hand.
06-01-05, 02:14 PM
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Oh god! You should know better than to listen to me!
06-01-05, 05:44 PM
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Originally Posted by rotarygod
Hand lapping irons is like trying to resurface your brake rotors with sandpaper. You just can't do it that way.
i DO have pretty bad rotors...
anyways...people have done it this way and have had success...and i have 3 extra engines...i think that my compression problem was in the apex seals anyways...so im just gonna give it a shot
06-01-05, 06:13 PM
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Originally Posted by rotarygod
...is like trying to resurface your brake rotors with sandpaper. You just can't do it that way.
you can't?
damn, I had better go change the cardboard pads while I am at it.
06-01-05, 07:15 PM
#22
Lapping Cast Irons
"a nice shiny new surface would be nice...so ill just go buy a bunch of valve grinding compound and give it a shot..."
After lapping the surface will be very dull, with almost no reflectivity.
I spoke with Don Hayes about this recently, and he has someone locally in Seattle that he sends them to for lapping, and was quoting me significantly less money than people are talking about here. I don't know if it is Precision or someone else. But it definitely is not a job to do by hand.
If you do lap them be sure you drill out the plugs and flush and brush out the oil galleries to get rid of the lapping compound. Then you have to tap and plug the holes. Otherwise you may end up with a 500 mile engine!
If they need resurfacing, I think you will need to have them ground with a Blanchard grinder before lapping. The lapping is just for surface finish, it needs to be perfectly flat before lapping.
If you are going for high power, I have a really nicely ported set of cast iron that was running at about 250 horsepower with a Holley, but had a failure in the apex seals. These have been reground, but need lapping. I would also have any internal hard parts you need, everything but the seals.
thestilettoman@msn.com
After lapping the surface will be very dull, with almost no reflectivity.
I spoke with Don Hayes about this recently, and he has someone locally in Seattle that he sends them to for lapping, and was quoting me significantly less money than people are talking about here. I don't know if it is Precision or someone else. But it definitely is not a job to do by hand.
If you do lap them be sure you drill out the plugs and flush and brush out the oil galleries to get rid of the lapping compound. Then you have to tap and plug the holes. Otherwise you may end up with a 500 mile engine!
If they need resurfacing, I think you will need to have them ground with a Blanchard grinder before lapping. The lapping is just for surface finish, it needs to be perfectly flat before lapping.
If you are going for high power, I have a really nicely ported set of cast iron that was running at about 250 horsepower with a Holley, but had a failure in the apex seals. These have been reground, but need lapping. I would also have any internal hard parts you need, everything but the seals.
thestilettoman@msn.com
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