Pulled the trigger....
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Outstanding HDF Member
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From: Vancouver Island, British Columbia, Canada
Pulled the trigger....
Thanks to SuperA and the rest of you, I've pulled the trigger on the SE 6 speed gear set. This stems from my "winter tune up" which lead to upgrading my SE 257 cam. Which lead to the primary gearing (SuperA) which I will change. With doing this, the tranny needs (benefits really) to be changed out. Gotta great deal ($1500 Canadian - yikes) on the tranny which is why the whole package is going to happen.
So my indy is strongly recommending the Head Quarters 575 cam. I don't know which primary drive to install (3.37?). The SE 6 speed is a done deal.
Comments on the cam and the primary? Anything else I must do while I've got it all apart?
Thanks again. It should be an incredible change to my ride this winter. New Metz ME880's are going on at the same time. Wahoo!
So my indy is strongly recommending the Head Quarters 575 cam. I don't know which primary drive to install (3.37?). The SE 6 speed is a done deal.
Comments on the cam and the primary? Anything else I must do while I've got it all apart?
Thanks again. It should be an incredible change to my ride this winter. New Metz ME880's are going on at the same time. Wahoo!
Road Captain
Joined: Oct 2007
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From: Torrance, CA.
Do the 3:37 for sure. I have the SE 6 speed in my RoadKing and with the 3:15 gearing, the 6 speed was useless under 80mph.
If your heads are still stock, you would get a noticable performance gain by having them ported with a high lift cam.
If your heads are still stock, you would get a noticable performance gain by having them ported with a high lift cam.
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Thanks for your response. Cam is mentioned above. Engine is done as discussed in the "winter tune" thread in this forum.
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The 3.37 allows you to use the same primary chain you have(assuming you have the 3.15), just needing to switch out the clutch basket and compensator sprocket. Before I could comment on the cam, what are the HQ 575's timing specs exactly? I'm more of a Woods/Andrews cam fan(they perform period), dont care for SE and some of the other companies who put out grinds.
Last edited by SuperAhcmed; Oct 24, 2008 at 08:34 AM.
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The 3.37 allows you to use the same primary chain you have(assuming you have the 3.15), just needing to switch out the clutch basket and compensator sprocket. Before I could comment on the cam, what are the HQ 575's timing specs exactly? I'm more of a Woods/Andrews cam fan(they perform period), dont care for SE and some of the other companies who put out grinds.
HQ-TC-575-G Fire Storm special gear driven type
This cam was designed for baggers with compression ratios 9.75 - 10.5:1. It will provide very strong torque figures
Intake 20/40 240 .575 lift
Exhaust 52/24 256 .530 lift
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From their website: http://www.head-quarters.com/html/tc_cams.html
HQ-TC-575-G Fire Storm special gear driven type
This cam was designed for baggers with compression ratios 9.75 - 10.5:1. It will provide very strong torque figures
Intake 20/40 240 .575 lift
Exhaust 52/24 256 .530 lift
HQ-TC-575-G Fire Storm special gear driven type
This cam was designed for baggers with compression ratios 9.75 - 10.5:1. It will provide very strong torque figures
Intake 20/40 240 .575 lift
Exhaust 52/24 256 .530 lift
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Outstanding HDF Member
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From: Vancouver Island, British Columbia, Canada
This is a dual profile cam that IMO works best with stock heads that have less efficient exhaust valve/port designs. Normally cam profiles that have limited lift and longer duration timing specs on the exhaust side are designed for more restricted port/valve combinations. Your running a SE head though right? If so, which one specifically?
6546-99 1550 CONVERSION KIT
16952-99C KIT, SE CYLINDER HEAD
17997-99A QUICK INSTALL PUSHROD
22868-00 SE TC88 HC1550 PIST
25155-00 SE 257 CAM KIT
32076-04 KIT, COMPRESSION RELEASE
32753-01 CYLINDER BASE COLLAR
37951-98 DIAPHRAGM SPRING
Apparently my set up should produce 10.5:1 compression.
Heads:
SCREAMIN’ EAGLEŽ PRO TWIN CAM MCR
PERFORMANCE CYLINDER HEADS
We’ve combined the proven Screamin’ Eagle valve train
components and innovative port shapes from our EvolutionŽ
1340 cylinder heads with the Twin Cam engine “bathtub”
combustion chamber with a volume of 76cc’s to create a
cylinder head that really performs. Valve spring can accom-
modate up to .575" valve lift camshaft kits and up to 6500
RPM. Heads are machined to accept Mechanical Compression
Release P/N 32076-04. All EFI models require ECM calibration (priced separately). For race application only.
Pistons:
SCREAMIN’ EAGLE PRO TWIN CAM HIGH
COMPRESSION FORGED PISTON KITS* – 3-7/8" & 3-3/4"
These pistons have been designed to be used with our
Twin Cam Performance Heads and can also be used with
stock cylinder heads. These pistons are forged for higher
RPM capability than cast pistons, and come complete with
rings, wrist pins and clips. These pistons cannot be used
with “HTCC” heads or in Stroker applications. All EFI models
require ECM calibration* (priced separately). For race appli-
cation only.
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Tourer
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That's not what Doug from HQ (the maker of the cam) would tell you.
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Well I tend to go more by what actual specs dictate than what the "salesman"(and I dont think "HQ" makes the cams, they probably have another company make a spec'd profile for them) says. The specs on this cam are very similiar to some dual profile cams made by S&S and Kuryakyn. Both who make a dual profile cam that tries to work around the restriction on the exhaust side of the twin cam heads. Many times when you see an exhaust lobe profile with a shorter lift and longer duration it tends to mean the exhaust port in question can potentially be "restricted" a bit. Not always the case, but many times it is. And it doesnt mean that a cam like this wont work well with a better breathing head, just many times its not always optimal.
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Toolguy: Best bet would be to use the Woods TW 5G cam. Its a real stump puller. Single profile cam designed for baggers and heavy loads(2up riding). It hits HARD right off idle and it was specifically designed around the SE heads you have. This grind has been a proven performer with the combo you have. And with your new 3.37 gearing and SE 6 speed, you will be grinning from ear to ear in ANY gear every time you twist the throttle. Don't waste time even thinking about another grind.