engine bring rebuilt and found scalloped rotors
#1
engine bring rebuilt and found scalloped rotors
So my engine rebuild is almost done, and everything looks good. There were a some very surprising things once the engine was opened up.
First thing was that the engine was already ported (which was going to have a medium street port done) it turned out that the port that was done was actually a large port so I lucked out there.
The next thing was that the rotors were scalloped, which I had never heard of till now. Chris (I don't remember his forum name) said it was a good thing. I was wondering if someone could elaborate on this for me and help me understand what kind of benefit I get from these?
First thing was that the engine was already ported (which was going to have a medium street port done) it turned out that the port that was done was actually a large port so I lucked out there.
The next thing was that the rotors were scalloped, which I had never heard of till now. Chris (I don't remember his forum name) said it was a good thing. I was wondering if someone could elaborate on this for me and help me understand what kind of benefit I get from these?
#7
And unfortunately since my engine apparently had them you wont be seeing a before dyno here either, but you will see an after.
Another question how should they act in conjunction with a larger port, since I apparently have a larger port already done and the rotors were scalloped already. The only issue we found was that the exhaust pets were left stock after the large port was done and we didn't know why it was like that
Another question how should they act in conjunction with a larger port, since I apparently have a larger port already done and the rotors were scalloped already. The only issue we found was that the exhaust pets were left stock after the large port was done and we didn't know why it was like that
Trending Topics
#10
however, you already mentioned that your engine has big streetports and i will assume that that probably included much later closing. so you've probably already gone into low velocity at low RPM terriotory where there may be a lope in the idle. only you can speak on that at this point.
is your car turbocharged?
#12
see if you can find a photo of a clean Renesis rotor and carefully look at that compared to yours, you'll see what i mean.
#15
Smells like 2 stroke.
Doesn't 'brap' or an idle 'lope' partly come from early opened intake/late closed exhaust also known as port overlap? Maybe the reason it didn't brap is because the exhaust ports were left stock, or not closing late enough to induce a rough idle. Furthermore, I thought the rotor scallops helped close the intake side ports later, not open them earlier. I guess if the scallops were severe enough they would do both.
#16
yes. the loping (the BRAP) comes from increased overlap. the stock exhaust ports would be my guess, but other factors could be at play as well.
as for the opening-closing question with the bevels. remember that there is a lead side and trail side to the rotor, so the same bevel that opens the port has nothing to do with closing it.
as for the opening-closing question with the bevels. remember that there is a lead side and trail side to the rotor, so the same bevel that opens the port has nothing to do with closing it.
#20
Rx2 > FD
iTrader: (10)
It is an extremely good thing. Consider yourself very lucky. Beveling or scalloping rotors is nothing new. It has only come into the lime light in the last few years. Before that it was mainly kept hush hush in the drag racing and road racing scene.
It's usually around a $300+ job with mandatory balancing. Another $300. You have a sweet rotating assembly sitting there and you didn't even have to send out and pay for the work...
Lucky you.
If you do not want to keep them, PM me. I would be interested in them for sure...
It's usually around a $300+ job with mandatory balancing. Another $300. You have a sweet rotating assembly sitting there and you didn't even have to send out and pay for the work...
Lucky you.
If you do not want to keep them, PM me. I would be interested in them for sure...
#22
It is an extremely good thing. Consider yourself very lucky. Beveling or scalloping rotors is nothing new. It has only come into the lime light in the last few years. Before that it was mainly kept hush hush in the drag racing and road racing scene.
It's usually around a $300+ job with mandatory balancing. Another $300. You have a sweet rotating assembly sitting there and you didn't even have to send out and pay for the work...
Lucky you.
If you do not want to keep them, PM me. I would be interested in them for sure...
It's usually around a $300+ job with mandatory balancing. Another $300. You have a sweet rotating assembly sitting there and you didn't even have to send out and pay for the work...
Lucky you.
If you do not want to keep them, PM me. I would be interested in them for sure...
770 primaries
1600 secondaries
Lt8 microtec
T3/4 50 trim
Front mount intercooler
3mm superseals
255 walbro fuel pump
3 inch turbo back exhaust
Turbo xsManual boost controller
Hks ssq blowoff valve
Adjustable fpr
Large port on the intake
And of course the beveled rotors
There is probably more I'm forgetting but you get the idea.
When I got it out needed a tune and to turn up the boost cause it was only boosting 4 pounds due to a 4 pound spring in the wastegate
#24
NASA-MW ST4
iTrader: (7)
i was just saying that compared to some, yours have a lot of material taken out of them. they're not the MOST extreme i've seen though. if memory serves i think i saw a CLR set (or maybe it was Defined) that basically left only the recesses on the rotor face.
see if you can find a photo of a clean Renesis rotor and carefully look at that compared to yours, you'll see what i mean.
see if you can find a photo of a clean Renesis rotor and carefully look at that compared to yours, you'll see what i mean.
Defined's bevels are done by CLR, and yes they are more extreme.