Big motor guys: If you had to do it all over again... iron 408, AL 422, 427, 434?
09-30-2002, 10:56 AM
#21
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Re: Big motor guys: If you had to do it all over again... iron 408, AL 422, 427, 434? Visceral,
The trouble I'm having is finding a big inch aluminum combination that will hold up to open road racing, track days, lapping days etc. It's comparatively easy to come up with a reliable street/strip motor, but their stresses don't even begin to compare to a road racing environment. What combination has been tested at 6000+ rpm for 90 miles ? What engine builder brags about repeated 45 minute road course runs ? Nobody seems to use these engines in this manner, so it seems as if you're out on your own .
The trouble I'm having is finding a big inch aluminum combination that will hold up to open road racing, track days, lapping days etc. It's comparatively easy to come up with a reliable street/strip motor, but their stresses don't even begin to compare to a road racing environment. What combination has been tested at 6000+ rpm for 90 miles ? What engine builder brags about repeated 45 minute road course runs ? Nobody seems to use these engines in this manner, so it seems as if you're out on your own .
09-30-2002, 11:24 AM
#22
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Re: Big motor guys: If you had to do it all over again... iron 408, AL 422, 427, 434? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Racehead:
<strong>What engine builder brags about repeated 45 minute road course runs ? Nobody seems to use these engines in this manner, so it seems as if you're out on your own .</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I don't see many of them bragging, but there are at least two that I think have done their homework. Katech was instrumental in the development of the C5R....LG motorsports (not really an engine builder as you might have defined one) might have a good idea to what will hold up to the stresses of roadracing. I think you should give them both a call and see what they have to say.
<strong>What engine builder brags about repeated 45 minute road course runs ? Nobody seems to use these engines in this manner, so it seems as if you're out on your own .</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I don't see many of them bragging, but there are at least two that I think have done their homework. Katech was instrumental in the development of the C5R....LG motorsports (not really an engine builder as you might have defined one) might have a good idea to what will hold up to the stresses of roadracing. I think you should give them both a call and see what they have to say.
09-30-2002, 01:00 PM
#23
Re: Big motor guys: If you had to do it all over again... iron 408, AL 422, 427, 434? Currently I have a 383. For the next one, I am stuck between these two:
1) 4.030" x 4.125"
2) 4.120" x 4.125"
1) will be cheaper because the LQ4 only needs to be overbored.
2) will be more expensive, but more rwhp and rwtq.
Either one should handle lots of Nitrous <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
1) 4.030" x 4.125"
2) 4.120" x 4.125"
1) will be cheaper because the LQ4 only needs to be overbored.
2) will be more expensive, but more rwhp and rwtq.
Either one should handle lots of Nitrous <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
10-01-2002, 12:49 AM
#24
LS1Tech Co-Founder
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Re: Big motor guys: If you had to do it all over again... iron 408, AL 422, 427, 434? I have a 4.060 bore LQ4 with a 4.075 stroke... offset ground 4.000 Lunati crank.
I think a 4.050 x 4.125 would be a tq monster and a lot of fun, I bet you would be fine with a 3.42 gear.
I am a fan of iron, I cannot deal with the downtime of having block problems.
I have a few thousand miles on my block and it's fine.
I think a 4.050 x 4.125 would be a tq monster and a lot of fun, I bet you would be fine with a 3.42 gear.
I am a fan of iron, I cannot deal with the downtime of having block problems.
I have a few thousand miles on my block and it's fine.
10-01-2002, 08:47 AM
#25
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Re: Big motor guys: If you had to do it all over again... iron 408, AL 422, 427, 434? I have had a 436ci (4.125 x 4.100) ARE Resleeved Alum LS1 in my car now for 6 months and 12,000 miles without any problems at all. I havent burned a drop of coolant and it is still making the same great power it did when I first picked it up..
I have only made it to the drags a couple of times but it has got me through 3 lapping days at 2 different roadcourses. The most recent was this past weekend at Toronto Motorsports Park (Cayuga) where I did three 35mins lapping sessions.. The engine and car handled it perfectly, even with oil temps in the 280s and coolant temps in the 230s.. I do HIGHLY recommend a coolant system upgrade if you plan on roadracing your big cube stroker though.. I have an integrated heavy duty radiator/oil cooler setup on my car and it helps out quite a bit.. When I used to roadrace with just a heads/cam package my temps would keep creeping up and up until eventually I would have to come off the track..
I wouldnt change my setup at all, other than maybe go with a slightly less comrpession ratio to totally eliminate detonation when it is REAL hot out.. For now, I just mix some 110 octane with 94 when I am going to be doing a track event and it works great.
I have only made it to the drags a couple of times but it has got me through 3 lapping days at 2 different roadcourses. The most recent was this past weekend at Toronto Motorsports Park (Cayuga) where I did three 35mins lapping sessions.. The engine and car handled it perfectly, even with oil temps in the 280s and coolant temps in the 230s.. I do HIGHLY recommend a coolant system upgrade if you plan on roadracing your big cube stroker though.. I have an integrated heavy duty radiator/oil cooler setup on my car and it helps out quite a bit.. When I used to roadrace with just a heads/cam package my temps would keep creeping up and up until eventually I would have to come off the track..
I wouldnt change my setup at all, other than maybe go with a slightly less comrpession ratio to totally eliminate detonation when it is REAL hot out.. For now, I just mix some 110 octane with 94 when I am going to be doing a track event and it works great.
10-01-2002, 09:14 AM
#26
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Re: Big motor guys: If you had to do it all over again... iron 408, AL 422, 427, 434? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by racehead:
What combination has been tested at 6000+ rpm for 90 miles ? </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">See here: http://www.katechengines.com/engines/index.htm
Chris, I'm with you. There's just something about a "427" Camaro. The 427AL is my plan (albeit a ways off <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> ).
What combination has been tested at 6000+ rpm for 90 miles ? </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">See here: http://www.katechengines.com/engines/index.htm
Chris, I'm with you. There's just something about a "427" Camaro. The 427AL is my plan (albeit a ways off <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> ).
