LS3Customweld

Hello All,

I'm hoping some....or many....of the members on this forum have real world experience or a POV on this topic.

Basically I'm running a 2010 LS3 in a jetboat. The engine is closed cooled with a wet exhaust, which means that big cam shafts are off limits. The operating effiiciency of the Hamilton 212 jet pump maxes out at 4500 RPM.

Is there a way to obtain more HP at 4500 RPM using a close to stock camshaft? Would swapping the heads to 215cc cathedral port heads help build low and mid range horsepower?

The impellers use by Hamilton pumps are rate HP absorption at a given RPM so torque are actually mute.

Thanks.

07NBSChevy

iTrader: (1)

Honestly the best way is either More Cubes or Boost. If that is not an option, the some ported heads with a small Cam. Possibly a TSP 220R or around there. Anything much bigger will really only benefit in the upper RPM range past 4500rpm.

So you basically have an RPM Limit of 4500RPM?

I would look into a truck style intake as well, it will help gain some lowened and will pull way past 4500RPM. Also, more compression with higher octane gas will help in the lowend. If you can use 100 octane or higher I would look into 12:1 or higher compression ratio.

pantera_efi

iTrader: (1)

Hi, yes I agree and I have customers on the Snake River that use my recipe.
There is one in Alaska that uses my LS-376.
These are ALL "pump" users, my first "jet" engine was for a Drake Pump for John Drake.

Your first question = NO.
I assemble LS-2 engines for 1800 RPM 25K hour use that make great HP (180 HP).
This recipe DOES use the SMALL port head of the LS-1/2 family
The Camshaft spec is 180/200 .550" @ 102LC.

Your needs are different. MAX HP@4500 ???.
Sure I understand though so must you. (Torque x RPM/DIVIDED by 5252 = HP.

I now will use EAP with TORQUE results:

LS-3 OEM = 464
LS-427 (4.1" crankshaft) = 555
LS-3 with Truck Engine camshaft (LS-7) = 456 "Split Overlap"
LS-3 OEM @ Split Overlap (My Progear "billet" TS) = 467
LS-3 with Crower Regrind (your cam@$200.00) my specs = 468 (better low end torque).
I "modeled" 22 camshafts with mostly LOSSES over OEM LS-3 "good work GM" engine design.
LS-3 TBSS Intake Manifold with my Crower = 483
LS-427 with TBSS & Crower = 637 @ 4000 RPM
The Torque dropped at 4500 them up to 619 @ 5000.

The Hendrick head you have has GREAT flow, NO money should be "wasted".

The noted Torque drop may be due to limited exhaust information given, I used my customers specification.

Would you like my help, I would like Exhaust information ?
This bit of kit is what I can supply.
The END results are low cost for great gains with top quality components.

Lance

LS3Customweld

I guess I'll be more specific on the HP band I'm looking for:

4000 - 292
4100 - 315
4200 - 338
4300 - 365
4400 - 390
4500 - 415

Thanks,

pantera_efi

iTrader: (1)

OK, sure most of the work is finished :

LS-427 HP
486
485
484
498
511

LS-3 OEM with TBSS and Crower HP
429
429
426
429
437
449

This could be more accurate when Exaust Information is provided.

Lance

KW Baraka

iTrader: (7)

I know the SBC's can.....but can the cams in the LS engine be install with advance?

If so, I would recommend experimenting with that before buying new parts......maybe reinstall the cam with about 3* or 4* degrees advance as a start and see what that gets you......

If LS cams MUST be installed straight-up, then you can get a cam with the same general specs as your current cam but with more advance ground in.

Example.... 220*/230* with 112* + 2* LSA to a 220*/230* with 112* + 6* LSA.


That having been said, give Cam Motion and/or Brian Tooley a call for recommendations.....

KW

LS3Customweld

Thanks for the replies so far.