flow #'s for ported dart 225's
 

can ya'll please post complete flow numbers achieved with the dart 225's i just got mine back and they sound kinda low. ex flowed 224 cfm

int before

1 25 74
2 43 127
3 69 204
4 83 245
4.5 91 269
5 96 284
5.5 66 295
6 68 303


1 28 82
2 51 150
3 70 207
4 88 260
4.5 94 278
5 98 290
5.5 68 303
6 70 312
6.5 71 317

flowed @ 28" water


ok now can someone also please breakdown the numbers.....i know the col to the right is cfm and i figure on the left is lift but whats the middle? thanks.....the heads cost 910 to do the port work plus 250 to repair the chamber that was trashed... but since hans quoted me 850 originally thats what i payed plus $88 in tax.are the numbers ok?

Here is a little easier to read format. I do not know what the middle numbers are.

the middle is the percentage it flowed in range 3 on the flowbench then once it got close to 100% of that range they switched to range 4....decent numbers I suppose, what size valve?

Well here's another thread of a before and after with the Dart 225. Just food for thought.

https://ls1tech.com/forums/generation-iii-internal-engine/514551-dart-225-after-info.html

I had a set of PRC Dart Stage 2 heads that I sent back to Dart due to oil control issues. In return, the replaced my heads with some that they did a clean-up job on. They sent me full flow sheets from both sets of heads. In fairness, all flow numbers were achieved on Dart's inhouse flowbench.

PRC ported Stage 2 Darts

Intake...........Corr CFM.......%Exh/Int
.200............146.7
.300............210.6
.400............267.3
.500............302.1
.600............310.3
.700............308.1
Exhaust
.200............103.3............70.4
.300............143.7............68.2
.400............182.2............68.2
.500............207.1............68.5
.600............223.0............71.9
.700............232.3............75.4

Darts with cleanup work performed at Dart (not sure if 205 or 225 ports)

Intake...........Corr CFM.......%Exh/Int
.200............149.3
.300............205.1
.400............261.5
.500............293.2
.600............319.5
.700............334.0
Exhaust
.200............111.7............74.8
.300............153.3............74.7
.400............190.3............72.8
.500............218.0............74.3
.600............228.8............72.5
.700............235.7............70.6

All flow work was performed on a 4 inch bore with radiused inlets and no exhaust port adapter. I don't have flow numbers on what the box stock Darts flow, but I am sure someone on here has flowed a set. If not, call John over at Dart and I am sure he can get you some hard data.

Hope this helps!

Galen

thanks for the responses.....valves are 205 160 what type of oil problem where you having and is it common?

Oil problem is NOT common. Just about the only ones that had the problem were the ones ported by PRC. They no longer port the Darts that I know of due to this problem.

Galen

IIRC you got whatever issue it was fixed no-cost to you, correct? Well, I gave the 5.0 away and am rolling in an LS1 now :) Haven't seen you around although your car would stomp on mine :(

Yeah I am fairly sure PRC has NO idea what they are doing. Think they had basically a total recall on ALL those dart heads they ported.

Man, your bitterness for us not hiring you doesn't show at all. :rolleyes: We haven't sold ported Dart heads in over a year. Good work again Sherlock.

Trevor
Texas Speed & Performance

I agree... I feel bad that the Dart heads got a bad reputation due to work done on them by someone else. I think many people shy away from these heads due to all the problems with the PRC ported heads. I love mine. They are a great heads and you can't beat the price. I know I could have bought "better" heads but I just didn't want to spend $2000+. I bet PRC is not on Dart's christmas card list anymore!!!

The problem with the oil consumption was not a PRC problem.The problem was from faulty valve guides from Dart.This is a "beating a dead horse topic" no need to reopen this discussion.

Haven't seen anyone else with oil issue

Man those heads flow like shit on a 4 inch bore. U can get the same numbers out of ported 243s with stock valves on a 3.898 bore lol

All the benches are going to differ some. If you look at your before numbers compared to the PRC ported numbers, they are similar. Doesn't mean either are wrong but only shows to the issue of comparing results from different setups.

Do you have more information on their setup?

You can tell winter is here, search is being used and some necro-posting is going on. This thread was dead since April 1 2007.....................

Ha, didn't even catch that :jest:

And still since 2007 haven't heard of oil issues.
What i find funny on here is that guys ask questions on here everyone tells them to do a search.
Dare search and bring back wn old thread and someone got to criticize for bringing back a thread to life.


Yes I'm getting a set of Dart heads Today and looking to send them out for port work.

As you can see, there were some hotly contested oil issues with the Dart heads. From my reading, some were due to over porting and later Dart was having issues with guides. I belonged to another forum (now closed) where there were several builders using Dart heads and were running into too much guide clearance and later guides misaligned with the valve seat. One stopped using their heads because the corrections we're getting too costly.

Fast forward to today. AI I using Dart cores very successfully so I believe issues of the past have been corrected.

I ran Dart 205's when they first came out with no problems at all, however they were as cast.

Have you considered AI? Also, Bauer Racing did a lot with Dart 225's in the past and should be very familiar with them.