Tech:Engine/K Series/Camshaft: Difference between revisions
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There are two stock camshaft profiles. The first is found in Sprinter motors with twincarbs (K-B, 3K-B), it's an 18-58 (256 degrees). The second is found in all other K motors with solid lifters, and is a 16-50 (246 degrees) with 0.338" intake valve lift and 0.356" exhaust valve lift. | |||
The camshaft is modified by grinding the lobes, you don't have to buy a new cam when you want different valve openings. | |||
There are many, many aftermarket cam grinds available for these motors. Here are some popular ones: | |||
'''Tighe 112:''' 20-60, 260 degrees, 0.423" valvelift (probably the best for torquey street use, 7000rpm peak power) | |||
'''Tighe 104:''' 25-65, 270 degrees, 0.423" valvelift (stage 3 grind, Doug uses this cam, I use the same spec grind with less lift) | |||
'''Camtech 609:''' 33-64/72-32, 277/284 degrees, 0.435" valvelift (this is Stewart's cam, peak power 8000+rpm) | |||
'''Waggott 605:''' 21-61/63-19, 262 degrees, 0.347"/0.343" valvelift (stage 1 grind, Alex uses this one, peak power 6500rpm) | |||
Revision as of 12:17, 26 April 2005
There are two stock camshaft profiles. The first is found in Sprinter motors with twincarbs (K-B, 3K-B), it's an 18-58 (256 degrees). The second is found in all other K motors with solid lifters, and is a 16-50 (246 degrees) with 0.338" intake valve lift and 0.356" exhaust valve lift.
The camshaft is modified by grinding the lobes, you don't have to buy a new cam when you want different valve openings.
There are many, many aftermarket cam grinds available for these motors. Here are some popular ones:
Tighe 112: 20-60, 260 degrees, 0.423" valvelift (probably the best for torquey street use, 7000rpm peak power)
Tighe 104: 25-65, 270 degrees, 0.423" valvelift (stage 3 grind, Doug uses this cam, I use the same spec grind with less lift)
Camtech 609: 33-64/72-32, 277/284 degrees, 0.435" valvelift (this is Stewart's cam, peak power 8000+rpm)
Waggott 605: 21-61/63-19, 262 degrees, 0.347"/0.343" valvelift (stage 1 grind, Alex uses this one, peak power 6500rpm)