Originally it was going to be an old school Tunnel Ram car, but we could not get it to start, let alone run.
We ditched the TR in favour of an Edelbrock Super Victor MW 4-bbl inlet to match the Edelbrock Victor MW heads.
When we put the Inlet on, we thought it would be rude not to add the nitrous system at the same time. I designed and instaled it all in about 3 hours and it shows in terms of neatness but it works....
In view of time (and previous experience) we opted for simplicity.
As the motor was already 12:1, we had to be quite careful and also the fact that the ringswere not gapped very large.
We decided to run 100 shot in the first instance, and we will cap it at a 150 shot. We do not want to have to sweep up another engine quite so soon.
Therefore, I installed it so that it was idiot proof (Roydon was driving).
A single "Arm" switch provides the power and cut off to a WOT microswitch on the carb. In line with this was placed a low fuel pressure switch. One of these saved our bacon on the old engine when a fuel solenoid failed.
This "chain" provides the trigger to the Nitrous and Fuel Solenoid.
A separate circuit via a relay was installed for the purge.
A simple 4500 spray plate was used and the jets table was reversed so that a greater proportion of Nitrous was added than Fuel. We have found this cuts down the chance of off the line bogs and ring damage from excessive unburnt fuel collecting in the Lands.
To off-set this we will retard the locked out ignition by 5 degrees as a result of a built in feature on the MSD Digital 6 unit.
The pick up was impressive. It had a different reaction to the old Plodge engine. The old engine was a torque monster that was great on the line but with no top end due to lack of Port Flow.
In the case of the MW engine, it had bags of Flow (and therefore Horsepower) but was not great off the line. Using the nitrous helpd this and this meant it could then pull the revs at the top end. Result.
We have done limited tuning (none!!!
) so I think we can get another 8mph out of it and improve the 60ft times - these will never be dramatic due to the gear / tyre combo to pull the mph but we hope to get to 1.50 60 foot times to get to around a 9.5 ET.If not then lots of humble pie later on at the HRD's!!!
Pete
) ... my Holley reg and guage used to read 9 psi and it turned out to be 4 psi.