Injected
15+ Year Contributor
- 704
- 16
- Apr 29, 2004
-
Houston,
Texas
As if there aren't enough stroker threads, I'm starting to collect the parts and I found a 4G64 crankshaft (6 or 7 bolt, I'm going 6 bolt) and bearings for a good price.
http://www.rpmmachine.com/fr_index.html?/crankshaftkits.html
Has anyone had success with reground cranks, or should I spend way too much for a new one.
These cranks are fully processed:
Crankshaft Kits
All Crankshaft Kits contain a precision ground crankshaft and a matching set of bearings.The Bearings supplied in your crankshaft kits will be one of 3 brands depending on what your crankshaft is. (domestic or foreign) Most domestic cranks will be supplied with Clevite77 or Federal Mogul engine bearings. Most foreign cranks will be supplied with Top line engine bearings.
All Crankshafts go through a magnetic particle testing (magnuflux) process to insure that they have no cracks. This process is done with a Peterson Wet Mag. All Crankshafts are cleaned thermally and the shotpeaned to stress relieve the crankshaft
We inspect the nose and seal areas of all crankshafts for problems and fix where necessary.
All crankshafts are precision ground in a state of the art crankshaft grinder. In the Sandy Utah facility all crankshafts are ground with a Berco 270 Crankshaft Grinder
After grinding all crankshafts are micro polished and all oil galleys brushed out to remove any foreign particles that may be lodged there.
In the Sandy Utah Facility is where we do all of our performance grinding and balancing. At this facility all crankshafts ground are also indexed while grinding them. This next bit of information will explain what Indexing is and how it relates to the performance of your crankshaft.
When a crankshaft is turned to an undersize, it can and does change the stroke and degrees apart of each rod journal. To index a crank, first the machinist has to know where the stroke and degrees (swing) are. Once this is established, with the right machine to start with, we can index your crank both on swing and stroke.
R.P.M. has the right machine to do this indexing process and the cost is only $35.00 more for indexing. Indexing is part of the blueprint process and is very important in setting up compression, because of deck height variation. Different stroke between rod journals, can change compression ratios between cylinders. Also swing (degrees apart between rod journals) will change the relationship between the camshaft and crankshaft.
Most cranks can be indexed and still make .010 undersized journals, if the crank isn't too far off from the factory.
Our crankshafts are ground to within +or- .0001 (that's one ten thousands of an inch) on rods and mains. This gives you a crankshaft that will give you full bearing contact with a lot longer life.
So, as a review, indexing is simply grinding all crankshaft rod journals to be all the same stroke as well as the right degrees apart. This gives us a final product that has all the cylinders doing the same thing at the same time in relation to your camshaft.
http://www.rpmmachine.com/fr_index.html?/crankshaftkits.html
Has anyone had success with reground cranks, or should I spend way too much for a new one.
These cranks are fully processed:
Crankshaft Kits
All Crankshaft Kits contain a precision ground crankshaft and a matching set of bearings.The Bearings supplied in your crankshaft kits will be one of 3 brands depending on what your crankshaft is. (domestic or foreign) Most domestic cranks will be supplied with Clevite77 or Federal Mogul engine bearings. Most foreign cranks will be supplied with Top line engine bearings.
All Crankshafts go through a magnetic particle testing (magnuflux) process to insure that they have no cracks. This process is done with a Peterson Wet Mag. All Crankshafts are cleaned thermally and the shotpeaned to stress relieve the crankshaft
We inspect the nose and seal areas of all crankshafts for problems and fix where necessary.
All crankshafts are precision ground in a state of the art crankshaft grinder. In the Sandy Utah facility all crankshafts are ground with a Berco 270 Crankshaft Grinder
After grinding all crankshafts are micro polished and all oil galleys brushed out to remove any foreign particles that may be lodged there.
In the Sandy Utah Facility is where we do all of our performance grinding and balancing. At this facility all crankshafts ground are also indexed while grinding them. This next bit of information will explain what Indexing is and how it relates to the performance of your crankshaft.
When a crankshaft is turned to an undersize, it can and does change the stroke and degrees apart of each rod journal. To index a crank, first the machinist has to know where the stroke and degrees (swing) are. Once this is established, with the right machine to start with, we can index your crank both on swing and stroke.
R.P.M. has the right machine to do this indexing process and the cost is only $35.00 more for indexing. Indexing is part of the blueprint process and is very important in setting up compression, because of deck height variation. Different stroke between rod journals, can change compression ratios between cylinders. Also swing (degrees apart between rod journals) will change the relationship between the camshaft and crankshaft.
Most cranks can be indexed and still make .010 undersized journals, if the crank isn't too far off from the factory.
Our crankshafts are ground to within +or- .0001 (that's one ten thousands of an inch) on rods and mains. This gives you a crankshaft that will give you full bearing contact with a lot longer life.
So, as a review, indexing is simply grinding all crankshaft rod journals to be all the same stroke as well as the right degrees apart. This gives us a final product that has all the cylinders doing the same thing at the same time in relation to your camshaft.
