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Generation III Internal Engine 1997-2006 LS1 | LS6
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SI4 vs 228R

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Old Sep 28, 2008 | 01:25 AM
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Default SI4 vs 228R
So...what is the different between Speed Inc.'s SI4 and Texas-Speed's 228R?(other than the LSA)

SI4 228/228 .588/.588 113
228R 228/228 .588/.588 112 or 114
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Old Sep 28, 2008 | 05:36 PM
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The name the packaging and the place which you buy them from.
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Old Sep 28, 2008 | 05:50 PM
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I would GUESS the lobes. The 228r is on XE-R/XE-R Comp lobes. Not sure on the SI cam.
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Old Sep 29, 2008 | 09:41 AM
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The current 228r is definately XER lobes. If you'd like to checkout some engine dyno data from our cam swap testing give us a call. We can fax you over tons of dyno results!!
http://www.texas-speed.com/shop/item...d=167&catid=44

Baseline
http://www.precisionracecomponents.com/stock.jpg

228R
http://www.precisionracecomponents.com/228r.jpg
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Old Jun 16, 2012 | 10:16 PM
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Bumping up an old *** thread. Since it was never answered.
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Old Jun 17, 2012 | 11:05 PM
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seems like it was answered to me. id check to see what lobes the SI4 has, and see if they are going to provide the results your looking for in the cam. I do not want to be biased, but I can say my 228r @ 114 netted me 393rwhp with stock heads through an auto
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Old Jun 18, 2012 | 04:43 PM
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From what i can gather they are the same cam on Compcam XER lobes just different LSAs
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Old Jun 19, 2012 | 09:00 PM
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Agreed with above.. can't imagine 2 different lobe designs having identical lifts at the same duration.
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so what does the 1 degree in LSA really change?
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Old Dec 31, 2012 | 02:53 PM
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The idle characteristics and where the power band starts and ends on that cam.
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