johnster

iTrader: (27)

243/248 610/615 on 110

what u guys think?

cam

iTrader: (9)

Thats pretty huge. What cubes are you running?

johnster

iTrader: (27)

going to put it in a 6.2L

cam

iTrader: (9)

Hmm well I just bought a cam for a 6.2L and its a LOT smaller than that. I was advised that you dont need donkey dick cams to make big power on stock cubes and L92 heads. Not sure what your goals are or where you found this cam but from the people who post here who are making big power of late with the L92 heads thats a very big cam in comparison. Mind you there was a guy i saw who ran the GM perf stage 3 cam and it had 27x exhaust duration and he claimed he loved it so?

It also seems that lobe selection is CRUCIAL to getting the most out of the L92 heads.

69LT1Bird

iTrader: (1)

Why do you want to run that cam in a 6.2L?

johnster

iTrader: (27)

cause i got it sitting around! its a trex cam

cam

iTrader: (9)

I wouldnt run that cam through L92's I dont think it will work very well. IIRC the TRex was designed specifically for stock LS1's through manifolds to extract every last drop of power out of them by working around the stock restrictive intake manifold and exhaust manifolds and even then it was a crazy cam and not very real world usable.

IHEARTLS1

iTrader: (1)

you can't just say it won't work. especially without knowing what the goals for the engine/car are. tell us about the combo. you LS people are so afraid of putting cams in your engines. that cam is mild in a sbc/bbc. 110 lsa i assume you are going carbureted?

cam

iTrader: (9)

Dude Im trying to save the guy some hassle. Sure it will run and yes it will probably make decent power but these engines make 400+hp stock. If he wants to install the TRex he'll almost certainly have to flycut his pistons and put some pretty big double valve springs in there to control it. Also if you have spent as much time as i have researching and selecting the perfect cam for max power through L92 heads on 6.2L of displacement then you would also know that cams big duration and tight lobe centers DO NOT work on L92 heads because of reversion problems and as a result make far less power then say a 114 which most small cube engines make the most power with. With big cubes sure the cam starts to make more sense but otherwise its likely a big waste of time and money to stuff it in and it would be a shame to spend that kind of money on something that probably wont work very well.

pillagenburn

iTrader: (2)

If I remember correctly, L92 heads (unless you've hogged out the exhaust ports) require a LOT of exhaust duration in relation to intake duration to compensate for that massive intake valve.

garygnu

ask Predetor-Z.

hymey

The Trex was designed for a small port head ie, LS1 not to many cams that big will like stock manifolds, clear that up first.

L92s will work with any cam but keep overlap down 0 to 4 degrees, use xfi, or lsl intake lobe, single pattern and wider lsa like 115 to 116, ie 236 xfi, 235 LSK intake and 234-236 xer ex, will make 520 stock heads.

johnster

iTrader: (27)

so if i run a set of afr 225 on this short block this cam would be ok?

IHEARTLS1

iTrader: (1)

lol research. does that mean you googled it and asked this website for advice? or maybe you kept playing with desktop dyno? when was the last time you drove desktop dyno or google down the race track?

these engines are not magic. the same basic principles as any other engine still apply.



OP, if you already have the cam, run it. you will probably need to flycut, which isn't a big deal. i have a junk l92 head and a cutter if you'd like to rent them.

Josh@PremierAutosports

iTrader: (11)

Yes it would be ok but nowhere near optimal. Sell the cam off for $200 ish and buy the proper camshaft for your setup. A camshaft is cheap and it dictates how the whole car preforms and acts so don't just slap in a ok cam because you have it laying around.

cam

iTrader: (9)

Stuff it in there and see for yourself and offer up some proof of your own rather than bitch talking and being rude. Theres hundreds of builds with L92 heads on 360-380 cid engines with track vids and dyno charts to prove cams like the TRex dont work for **** on these set ups unless your willing to buzz the thing to 7500+ RPM.

As for what the TRex was designed for seeing as you debunked it earlier dont take my word for it. Take the word of the guy who designed it. Call Geoff ( formerly of Thunder Racing ) and now owner of Engine Power Systems and ask him directly what its designed for and how well it will work on L92 heads

http://www.engpwrsys.com/

johnster

iTrader: (27)

here is the deal! bout to get this 6.2L i already have a set of afr 225 mill 2 60cc and this trex cam. was thinking of saleing the heads and going with l92 heads, just cant make up my mind would the afr heads make more power or the l92 heads? {with the rite cam}

WKMCD

iTrader: (2)

This thread has a lot if information in it documenting three years of development using L92 heads on a 403 and finshing with a 427. Four different cams in total, 4 different LSA's (none larger than 113), 4 different lobes series and several different compression ratios, etc, etc, etc. It even has info on running the FAST 102.

https://ls1tech.com/forums/generatio...b-c-d-e-f.html

BTW: NONE of the cams were/are anywhere near as big *** that donkey dick you're asking about and all iterations made excellent street power.

Another idea is to contact someone who has had multiple successes with L92/LS3 builds and have them spec you a cam - SPECIFICALLY to your goals. Someone like Shawn at VA Speed would be my suggestion.

Just my $.02

cam

iTrader: (9)

I've attached a link that tests afr's back to back against L92's and the L92's just squeaked out a better number. So considering that the L92's perform at least as well as the afr's and the fact that you could sell the afr's for a lot more dough than you could the L92's it makes most sense to sell the afr's. The main reason you can score decent bucks for the afr's is they will go on a stock LS1 bore where the L92's cannot so there's a lot more market for the afr's in resale. I'd also sell that Trex and order a custom cam as mentioned there are numerous options out there and any of them will get you a cam that will perform far better than the trex and besides then you an tailor it specifically to
your needs ( which none of us know what they are yet. Drag car? Street strip? Street? Road race? All will require different grinds to optimize these goals )

http://www.gmhightechperformance.com...ugh/index.html

johnster

iTrader: (27)

the car is not my dd but i do like to drive it, its a auto with a 4k stall, got pro stars on it