TR224 with 1.85 rockers?

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Dec 15, 2003 | 04:51 PM

2001CamaroGuy

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TR224 with 1.85 rockers?

I am going to build a 392 big bore (4.125" bore/stock crank) and will be leaving the TR224/224 112LSA cam that I have now in it (going for a stock idle...sleeper). What kind of HP would I see converting from the stock 1.7 ratio up to the comp 1.85 rockers?

Dec 15, 2003 | 04:58 PM

jrp

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your looking at about .610 lift and if im understanding J-Rod right then 2* increase on duration so about 226 for both intake and exhuast.

Dec 15, 2003 | 04:59 PM

DaleMX

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When I got my TR Thunder said to stay at 1.7 because of the ramp rate on all their cams.

Dec 15, 2003 | 05:01 PM

jrp

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OT: but do you have heads with your tr224 setup now? and do you have a dyno sheet or your 400rwhp run. i was pretty much dead set on a tr224 but i've reconsidered and am doing some more cam research and im curious to see your powerband.

Dec 15, 2003 | 05:12 PM

2001CamaroGuy

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yes...I have stage 3 (prep work for the big bore motor) heads with my TR224. I can't post the graph (no scanner) but I can give you a line up of the torque/hp at each RPM.

121hp / 290tq @ 2200RPM
142hp / 309tq @ 2400RPM
161hp / 325tq @ 2600RPM
182hp / 341tq @ 2800RPM
200hp / 348tq @ 3000RPM
218hp / 357tq @ 3200RPM
231hp / 356tq @ 3400RPM
285hp / 357tq @ 3600RPM
262hp / 361tq @ 3800RPM
280hp / 367tq @ 4000RPM
298hp / 372tq @ 4200RPM
312hp / 372tq @ 4400RPM
329hp / 376tq @ 4600RPM
348hp / 381tq @ 4800RPM
366hp / 385tq @ 5000RPM
376hp / 380tq @ 5200RPM
385hp / 375tq @ 5400RPM
392hp / 367tq @ 5600RPM
398hp / 360tq @ 5800RPM
400hp / 349tq @ 6000RPM
398hp / 337tq @ 6200RPM
394hp / 323tq @ 6400RPM
385hp / 336tq @ 6600RPM
371hp / 287tq @ 6800RPM

If you notice, the torque peaks about 200RPM after the "TR graph with stock heads" which can only be due to the large valves/ports of my heads. I also have the cam advanced an extra 2 degrees (6 degrees total) so it would be another 200RPM up if it were "as ground" (4 degrees). Overall I'm happy with the results I got.

Why are you going down to a TR224 from a TR230? I wish I had gone with your cam when I did my H/C swap.

Last edited by 2001CamaroGuy; Dec 15, 2003 at 05:30 PM.

Dec 15, 2003 | 05:21 PM

jrp

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From: Valencia, Ca

Quote:

Originally Posted by 2001CamaroGuy

yes...I have stage 3 (prep work for the big bore motor) heads with my TR224. Why are you going down to a TR224 from a TR230? I wish I had gone with your cam when I did my H/C swap.

down grading cuz of emissions, i dont want to have to keep cam swapping. and i'd also like a lower powerband. i'd been set on the tr224 (already done plenty of research on it) but the mti c1 cam is looking nice too. i dont plan on getting gears so thats another reason for down grading.

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