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Old 06-25-2013, 01:24 AM
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Hmm.. So what you're saying is basically an original LJ crank can be but to 2.0 SJ or even the 1.888 honda journals without issues?? I wasn't aware of that. So that might be another option then. And yeah pretty sure the stock crank balance is gonna be closer for the spec of other parts of a stock rotating assembly.. Hmm
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Old 06-25-2013, 02:14 AM
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Ok after a quick call to my machinist I'm still somewhat in doubt what to do. Crank cut to the rods and mains will run me 250 euros (that's 330$). i guess it would be done on a lathe, vs. most machine shops in the US having a dedicated crank cutting machine to do it way more effectively and hence cheaper?

so again, the thought to use the nodular cast crank cause it's already here and i got it for a good price. so might re-sell it for the same or more money then heh.
i myself would step up to a lightweight forged crank for the hot 350 build.. might be better anyways since the nodular cast crank would be pretty much at its limits with 7+krpm and those power numbers or what do you guys think?

Last edited by janus; 06-25-2013 at 02:20 AM.
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Old 06-25-2013, 11:10 AM
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7k is not super high RPM,the valve train needs work and oiling system needs works,cranks are rarely an issue.I usually use stock steel cranks. 450 hp does not need 7k to produce that amount of power.buy good heads and a roller cam
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Old 06-25-2013, 11:48 AM
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is that what they say... well i'm hoping for 450+ hp, i got afr195 and a miniram intake. cam is a little small with a comp XR276 roller but wanna gather some expierence with tuning first.
i'm planning to swap the cam at some later point in time but leave the bottom end alone. so hence i was thinking i might as well build a good one now.
btw stock steel cranks as you mentioned, those might be stronger than that nodular crank i was gonna use...

sorry for thread title diverging from topic now btw

btw builder said today that going over 60 cut on the rods is no use since you might run into oil passages on original LJ cranks?

Last edited by janus; 06-25-2013 at 11:59 AM.
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Old 06-25-2013, 12:02 PM
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XR276 roller is that a hydraulic roller? the AFR 195s will take you over 7k and have potential to make a lot over 500 HP.think about hydraulic rollers as built in rev limiters(6500 ish)
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Old 06-25-2013, 12:04 PM
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that's right, hyd roller. i was thinking LS7 lifters would be good up to 7k

and yeah with the afr's flow potential i was trying to plan ahead with a tough bottom end, for a bigger cam and higher revs possibly.. might be trying solid roller in like 2 years down the road
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Old 06-25-2013, 12:22 PM
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That cam wont make power to 7k and why not use a solid roller? the ramps are better,the idle smoother and throttle response is excellent
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Old 06-25-2013, 12:26 PM
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i agree with the cam not making power to 7k. peak would prolly be 6.5kish?

just saying i would like to build a solid block & bottom end, so i can rev higher later when upgrading the cam/valvetrain. that make sense?

i'm not sure i can afford solid roller right now, the lifters are quite expensive no? might be depending on what i do about the crank though. but also i already have said 276 hyd roller cam.
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Old 06-25-2013, 12:45 PM
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I think that hydraulic cam you have will start to roll over about 5500 ish.The solid roller is cheaper that the hydraulic(lifters only) the rest is similar.The dynamic CR is determined by the camshaft,make sure you have it right for todays and tomorrows camshaft.
When techinspecter chooses cam specs,he will tell you to the what cam to use,it will be accurrate and work.to get the correct numbers you will need to reverse engineer/ask the question.
Dont tell him the HP you want,tell him the RPM you want and the heads you will use and he will pick the cam to fit.The HP will be what ever it is instead of mathematically figuring a specific HP number.
This is how I pick my combo,heads cam first,dcr next and what it takes to get there.
If you want 7k,then choose a cam and heads that flow enough to get you there and CR to make it work.then headers and fuel management
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Old 06-25-2013, 01:06 PM
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yeah i was shooting for a rather high DCR with that cam of around 8.7ish if i remember correctly, need to look up the calcs. i thought i might tweak ICL on the cam to get a little lower peak cylinder pressures tho.
not sure about those 5500 with the miniram...
thanks for the pointer on cam picking, and the solid roller sound clip you sent
what components are you using for solid roller and also what are your driving habits and corresponding maintenance for the SR valvetrain.
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Old 06-25-2013, 01:25 PM
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Ive adjusted the cam maybe once per year,not counting first year.I use rocker shafts for stability.I have 3.50 gears and drive in the city using 1st and second.5th gear around 65 mph is good for high way.my cam peaks at 6500 rpm with 256/264 duration,standard .420 lobe with 1.6/1.5 rockers
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Old 06-25-2013, 01:47 PM
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alright i see. still think i'll stay with hydraulic roller valvetrain for now... LS7 lifters should be fine with the planned rev range too? btw the xr276 is 276/281 (advertised) duration and about 560 lift with 1.6 RR.
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Old 06-25-2013, 02:16 PM
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very mild cam,only 230 duration @ 050,560 lift is also very mild, good 327 street cam IMO
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Old 06-25-2013, 02:47 PM
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well some questions that are more on topic now again:
what do you think is the limits of that cast crank? and if i do go forged for a nice solid bottom end, should i go with something lightweight? pistons as said are 500g, rods 575g.
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Old 06-25-2013, 02:56 PM
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when you say light weight,give an example please? Callies makes some very nice light weight cranks.
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