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Buell Forum » THUMPer Forum » Buell Blast Thumper Knowledge Vault » Engine - all topics related to the Motor » Archive through May 10, 2013 » 515 & Bigger Big Bore kit install « Previous Next »

A Little Head Info to be saved: Heres the story:
From what I hear, Aaron Wilson prefers a ported XB head to a ported Blast head. From what I hear, it comes down to you get a better starting point from the XB, and more fin area.
However, when I was talking to Jeff Ecklund, who is one of the Tuners for Bartells that builds Flat Track bikes, and he was telling me that of ALL the Sportster/Buell heads that he has Flow tested, that the Blast head flows the best out of the box. On the Bartells Blast - Based Flat Track bikes that he has recently built, they are using Blast heads. They used to use Sportster Sport Heads, and Thunderstorm heads
when they couldn't get Sportster Sport heads, but now he uses Blast heads because they work the best for him.
There you have it!
GT - JBOTDS! EZ



Agood set of springs and seals - this mod will help with cam clearance:

A note for cam installations:
Valve guide mod is easy - remove the seals, mark top of guide with a sharp pick or something to show how much needs to come off, use a drill bit that's larger than the guide O.D. and drill down to the mark (holding bit aligned with guide and steady so it doesn't jump around!), de-burr and round sharp edges w/ a dremel. Honing the guides would be a good idea, if you have the right size (dingleberry type hone). Re-install seals (you're supposed to use new ones - I didn't, and oil use has never been lower, go figure.

Another option - instead of cutting guides, just don't use the seals... might use oil, but who knows - you can always put them back on.

Retainer/seal clearance allows about .55" valve opening before interference, IIRC (see "replacement heads" thread to double-check!), so subtract that from your cam's advertised lift to get minimum required amount to be removed, then add a little extra (maybe .02") for good luck.

A machine shop (or a HEAD shop!) could do a much better job, probably pretty cheap too - but my setup is low-budget and intended to be temporary, so I just winged it...

060" is recommended.
Once again you've done a nice write up. I hadnt though of using a drill to just cut it away. Seems much easier than grinding!

  Thread Last Poster Posts Pages Last Post
Big bore blast helpRd35012 1 12-07-02  01:38 am
44 MagnumEzblast6 1 02-01-06  06:39 pm
600ccEzblast99 4 08-23-09  05:40 pm
Are You Man Enough to Handle a 44 Magnum?...Ezblast162 6 09-22-11  07:18 pm
Hp hikeGearheaderiko10 1 02-02-11  09:05 pm
NRHS & pro-series cam kitGearheaderiko40 2 11-16-06  09:16 pm
Archive through June 27, 2010Gearheaderiko30 1 06-27-10  09:37 pm
Archive through October 29, 2009Gearheaderiko30 1 10-29-09  09:06 pm
Archive through October 09, 2008Ezblast30 1 10-09-08  01:05 pm
Archive through August 08, 2008Sarodude30 1 08-08-08  04:18 pm
Archive through July 31, 2008Berkshire30 1 07-31-08  04:41 am
Archive through June 27, 2008Gearheaderiko30 1 06-27-08  11:12 pm
Archive through June 02, 2008Gearheaderiko30 1 06-02-08  10:19 pm
Archive through May 20, 2008Buelliedan30 1 05-20-08  03:09 pm
Archive through May 16, 2008Blake30 1 05-16-08  07:04 pm
Archive through May 15, 2008Blake30 1 05-15-08  03:41 pm
Archive through May 13, 2008Gbaz30 1 05-13-08  02:02 pm
Archive through May 05, 2008Buelliedan30 1 05-05-08  04:22 pm
Archive through March 23, 2008Buellistic28 1 03-23-08  06:59 pm
Archive through March 18, 2008Ezblast30 1 03-18-08  06:21 pm
Archive through February 20, 2007Gearheaderiko30 1 02-20-07  12:19 am
Archive through November 02, 2006Joey30 1 11-02-06  03:11 pm
Archive through August 29, 2006Buellistic30 1 08-29-06  04:13 pm
Archive through August 08, 2006Ezblast30 1 08-08-06  12:36 pm
Archive through June 29, 2006Blake30 1 06-29-06  09:29 pm
Archive through March 29, 2006Gearheaderiko30 1 03-29-06  11:48 pm
Archive through September 16, 2003Ezblast30 1 09-16-03  09:08 am
         

Author Message
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Ezblast
Posted on Thursday, February 03, 2011 - 02:42 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Yes he has! - lol
EZ
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Styxnpicks
Posted on Wednesday, March 16, 2011 - 06:49 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
so out of curiosity.. and since I havn't found time to actually finish my blast build... of those that have had a 515cc cp piston failure.. what cams were used and what octane fuel.. i've been doing a little number crunching and finding interesting results when it comes to dynamic compression ratio..
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Gearheaderiko
Posted on Wednesday, March 16, 2011 - 09:35 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
XB spec grind. 92-97 octane fuel.
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Styxnpicks
Posted on Wednesday, March 16, 2011 - 09:42 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
oh boy.. I bet I'll blow mine up before i even get it broken in.
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Gearheaderiko
Posted on Wednesday, March 16, 2011 - 08:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
You've just got to be all over it. Premium gas, timing, maybe even a little octane booster. Just be real sure you listen carefully for any knock or ping. I'd go slightly rich on the jetting too (slightly-though I'm not sure that will even help).
If you can get it dyno'd, even better.
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Styxnpicks
Posted on Thursday, March 17, 2011 - 12:03 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
I bet the key is with the timing. maybe stay with a street curve and run it a tad rich. I found the dynamic compression ratio to be 9.26:1 with the 515 kit and .551 xb cam setup.. the stock cam, b50 and, b70 having even higher ratios. granted theres more to the whole picture but it looks like the most popular cams have the highest comression ration due to where the intake falve closes. I think this might explain at least part of the reason why the some people have been having problems with their kits.
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Ezblast
Posted on Thursday, March 17, 2011 - 01:06 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Thats exactly what I did for my B70 cam - a tad rich with the stock curve - any more advancement had me pinging.
EZ
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Fathermike
Posted on Tuesday, July 12, 2011 - 05:09 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
hey i'm not sure if this has already been pointed out but revolution performance has dropped the price of their kits to $375.

http://www.revperf.com/revstore/product_info.php?c Path=101_68&products_id=100
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Ezblast
Posted on Tuesday, July 12, 2011 - 07:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Can't find it - where?
EZ
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Ezblast
Posted on Tuesday, July 12, 2011 - 11:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
I see Rev.'s at 499 and NHRS at 355 - that monetary difference is the fact that if correctly installed and tuned the Rev.'s kit will last practically forever, with just ring changes, while a whole new kit will be needed to replace the NHRS kit at rebuild time. So long term the Rev.'s kit is the better deal.
EZ
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Fathermike
Posted on Thursday, July 14, 2011 - 01:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
the link didn't work for you?

Here's a screen shot


515 for 375
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Ezblast
Posted on Thursday, July 14, 2011 - 02:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Thank you!!!!!! - Now that is a great deal!
EZ
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Spade115
Posted on Monday, October 03, 2011 - 04:42 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
I came to see this and found this : D THIS IS GREAT. : D Good reason to save some cash : D
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Manes1911
Posted on Wednesday, October 05, 2011 - 10:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Question, will a XB cylinder fit a blast directly or through modification? And if so does anyone recommend used Millennium cylinders?
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Gearheaderiko
Posted on Wednesday, October 05, 2011 - 11:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Fits directly...... Nothing wrong with Millennium cylinders (but without refreshing my brain) I dont know if they used the nikasil cylinders-which means the bore specs are a little different and nikasil cant be overbored (to my knowledge) or its expensive.
XB Pistons and cylinder heads are not interchangeable though and must be used together.
The XB cylinder has much more fin area too and XB9 & XB12 cylinders are the same.
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Gearheaderiko
Posted on Wednesday, October 05, 2011 - 11:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
...and Welcome!
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Manes1911
Posted on Wednesday, October 05, 2011 - 11:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
And thank you, guess I mite as well take my chances then.
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Manes1911
Posted on Wednesday, October 05, 2011 - 11:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Think this is anything approaching a good deal?
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?Vi ewItem&_trksid=p5197.c0.m619&item=180733041888&vie witem=&category=10064#ht_1065wt_1167
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Gearheaderiko
Posted on Wednesday, October 05, 2011 - 11:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
No. First do a search and see if the millenium cylinders used nikasil liners (I dont remember and I'm too busy to check-sorry). A good deal at half that price maybe. But a new Blast piston and cylinder kit w/rings will set you back about $225+shipping (XB kit is the same price!). Big bore kit $375-$500.
Many Sportster and Buell cylinders are interchangeable, including the 883 which can be bored out.
Save your money for something new or watch this item for a repost at half price. Unless you're doing a serious build up or racing, the Blast doesnt need the extra fin area of the XB cylinder, so there isnt much sense in paying a lot for it.
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Gearheaderiko
Posted on Thursday, October 06, 2011 - 12:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
PS Thats the 600cc bore, so you'll need the 600cc piston and bore your case too. The 600cc kit also sells for the same price as the 515 and the 600cc piston is over $300 when purchased separately.
I also dont see millenium on the cylinder, but that doesnt mean its not. I've only seen the ones that say Millenium on the cylinder.
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Manes1911
Posted on Thursday, October 06, 2011 - 12:06 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Thanks, kinda figured that about the price too. I'll keep my eye on it.
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Ezblast
Posted on Thursday, October 06, 2011 - 02:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Its Nikasil - lol -
EZ
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Swampy
Posted on Thursday, October 06, 2011 - 09:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
There used to be an old saying " there is no replacement for displacement"

but in the case of the Blast....my goodness...it is a 500

I'm thinking the correct head and piston, cams and ignition module, you can save the case boring for when you want to have things go BAANG!
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Spade115
Posted on Sunday, July 15, 2012 - 11:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
A buddy has a set of 883 heads and 1200 heads which would you all think would be better to run on the blast
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Gearheaderiko
Posted on Monday, July 16, 2012 - 01:32 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Neither. The 883 heads are different and the 1200 heads would depend on the year. But realistically it would be either a step back or just sideways. Unless the 1200 are late model XB spec heads. XB or a modified head is the only way to go.
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